Living here, they usually do single out Chinese tour groups. It’s not a cheap vacation for Americans to just go to Thailand. The raucous Americans that just want to get stupidly drunk on a hot beach while harrassing local women usually go to Mexico, Central America, or the Carribean. In Thailand you can usually pick out the Americans for being eager to eat spicy food on the streets in an attempt to ‘live like a local’ instead of at the stereotypical Western pubs. There’s a selection bias on the accessiblity and cultural interest that causes generally better-than-average, non-stereotypical Americans to find themselves in Thailand specifically.