>Damn, could you elaborate on these parts too?
I can try, but I'm not a native and have only so much exposure to them.
Thai were originally from Guangxi China about 1300 years ago and were chased out to the swamps which is already a minor source of asshurt, but the Thai see themselves as something of the "successors of China" while Chinese see Thai as backwoods inbred hillbillies that have usually been too much of a pain in the ass to conquer due to all the swamps. Prior to WWII, Thailand was constantly pushing out China's proxies/satellite nations to the south who were after cheap mining resources and natural resources that were abundant in their backwoods country. They fought off the Chinese so many times that they didn't have the manpower when the British invaded and so they basically said "yeah sure, whatever, you can be in charge we're just going to ignore you anyways" which royally pissed off the Brits.
During WWII, Thailand sided with Japan mainly because they didn't give a shit about the conflict and Japan happened to be the closest superpower. This caused unprecedented asshurt among the British who considered themselves the owners of Thailand, and America was basically the only thing standing between Thailand and Britain ass-raping Thailand back to the stone age after the war. Britain couldn't argue with America because of Americans winning the war for them, so they had to begrudgingly give up their Thai colonies. Because of this, Americans became an ally of convenience for Thailand even though they considered the Americans to be equivalent to the British since the Americans had a sense of honor still until about the 1960s.
The Americans brought chemical fertilizers to Thailand which allowed their city populations to absolutely explode at a level that makes the American baby boom look like a Saturday night at the bar without protection. During the Cold War period, Communist China did what they do best and constantly forced their proxies to invade Thailand to try and take land, but because of American guns and aforementioned chemical fertilizers leading to population explosion, the Thais kept curbstomping the Indochinese (Laos, Vietnam, Cambodia) and Burmese militants whenever they'd invade. Since Thai people kind of are hicks though they just went home when the fighting was done after raping a few bitches and killing the men. Thailand hated the Chinese as much as they hated the French, so they primarily stayed out of all the wars during the 50s-70s period unless America got involved. The second America got involved though, Thailand tended to jump on-board as well. This would have been ok except the Americans were experimenting with chemical agents/land mines and royally fucked up Thailand's Eastern border. This has been a cause of intergenerational asshurt towards Americans who refused to take responsibility for decades.
In the 70s, Thailand was dealing with a bunch of crap from pro-democracy folks the way Myanmar is now and the pro-democracy crowd hated America because of their wars in Indochina. The king placated them by recognizing West Taiwan over the Republic of China and establishing economic ties with the communists. He also threw out some of the military leaders in favor of lawyers who were loyal to his side. This placated the mentally defective portion of Thai society and the industrial half of Thai society begrudgingly agreed to the arrangement since they figured maybe China had finally turned a new leaf. Instead, Thailand got Chinese colonialism which destroyed the working man's ability to earn money while the Chinese passed out communist propaganda to said people they were disenfranchising which created a bigger and bigger Chinese-lead "pro-democracy" movement in Thailand until finally the military was fed up with China's shit and had a "bloodless" coup in 2006 where they told Thai parliament to fuck off, told the king to fuck off, and formed a pro-monarchy faction that could not be voted out of power by the democratic institutions allowed to stay in place post-coup. This has lead to political instability in the country for the last two decades but Western nations won't acknowledge it because Thailand is nominally an ally.
As of right now, China is allowed to run infrastructure projects because it's keeping the peace, but most Thai people see Chinese as illegal immigrants trying to take their jobs. The pro-democracy parts of Thailand hate the military junta who haphazardly manages to hold onto power while navigating murky waters, and the pro-monarchy party is losing influence, but still maintains a slim majority on power. The pro-democracy parties hate America because of Chinese propaganda while the military and monarchy hates China for finally managing to accomplish what they couldn't for the entirety of the 19th and 20th centuries (colonization of Thailand). China can't use their "colonialist oppressor" narrative on the Thai the way they do with Europeans because Thailand has a long history of kicking their shit in for trying to colonize their country, so they have to rely on economic diplomacy. The issue is a lot of Thai billionaires who have been in exile since the military coup are starting to come back to the country and undo Chinese propaganda for the last three decades with the power of money by cozying up to the junta which has China's panties in a twist since the Thai government could replace China with said billionaires and hire locally to finish the infrastructure projects, which is why China now wants a shared border with Thailand to put pressure on the country militarily.
>And if we are here, do you know anything about the attitudes of various groups in Myanmar towards international players?
The pro-democracy folks like the British and Americans, but they'll take weapons from anyone which is why they're currently accepting Chinese support since the British only gave them "thoughts and prayers" thinking they'd be crushed by the Junta in a year. The pro-junta folks are kind of a Nationalist-Corporatist entity in the sense that they are in central control of most of Myanmar's staple goods beer, rice, etc.
ran through corporations where the junta are the majority shareholders, but they'll trade with anyone who wants to do business with them. However, they are Khmer Rouge-levels of brutal iron fist which isolates them from most of the Western world who wants an easier-to-control puppet state in that region. Because of this, China and Russia are their only real allies since the two also share an attitude of not giving too many shits so long as it benefits everyone economically. As mentioned earlier though, the Burmese military cracked down on smuggling so now Chinese billionaires are ass-ravaged that they aren't getting jade rocks at a severe discount, and since corruption in China relies on the gifting economy to avoid detection, this in turn means the CCP is angry at the junta for making it harder to be bribed by Chinese billionaires using jade and gold statues and jewelry.
Most of the other Asian countries are trying to stay out of Myanmar because it's more trouble than it's worth, but they aren't going to give up their assets to the state junta unless said assets stop turning a profit/potential future profit. Everyone was ok with the junta arrangement until this most recent coup because Myanmar's situation was similar to Thailand, and most of them are only upset about the coup because it represents instability in the market which is hurting their oil shares.
>and I heard that there are Japanese businessmen who invest in the region, but maybe I'm missing something here.
During the bubble economy, Japan saw the housing market collapse coming and diversified their assets into all the neighboring Asian countries using government subsidies that were meant to allow for "Japanese economic colonization" abroad. The Japanese businessmen who did so were able to successfully navigate the domestic "pop" when the bubble economy collapsed. Japan has a large number of shares in Myanmar's brewing, rice, and oil industries because of this. Funnily enough, this is also why there are large number of Japanese businesses in Central and South America.
>I am now realizing that I know nothing about Southeast Asian attitudes
They can vaguely be split into three categories:
>We hate America because of Vietnam and abandoning Cambodia
>We dislike America, but we hate China significantly more because of their bullshit over the last thousand years which was ramped up to 11 under the CCP
>Super powers gonna fight lemme just drink my beer and eat my fermented fish paste in peace brah, yeah sure heil Hitler or Mao or whoever the fuck you fags have in power right now