Reviving an old thread again......but one of interest. I think the Thai tolerance towards foreigners is very superficial and has mostly to do with their love of money. Thais are the most racist people I have ever encountered, even to their own from Isaan or the south. When I first came to Thailand I was shocked by the overt racism displayed and endorsed by Thais. They're ethnocentric, believing in the absolute superiority of the Thai way and so ignorant of the outside world that they think all non-Thais are even more ignorant than they are. Open to other cultures they're most certainly not. Foreigners are tolerated because of their money and because the Thai way is to be polite in public, but don't mistake public politeness and tolerance for acceptance and open-mindedness. Foreigners will always be a curiosity and a resource to be exploited.
They're a hypocritical bunch too, banning pornography and alcohol on religious days, yet they have to be one of the most promiscuous people I have ever encountered. Thai women drop their panties really quickly and cheat on their partners without a seconds hesitation. I wouldn't by any stretch of the imagination call Thais open-minded; they're just tolerant of promiscuous sexual behaviour while condemning it in public. If you want to see the depths of their intolerance, just look at their political system.
I agree with the poster from 2015 who said that "there is always an undercurrent of pent up hatred for the farangs by thai guys". Absolutely; they detest that farang money can buy the girls they so desperately want to fuck and it does sometimes explode with calamitous consequences; such as when the jealous Tom throws a wobbly outside the bar she works at because she just wants to fuck all the coyotes and some customer is getting in her way, or when the Thai boyfriend comes to check on his girl after she's finished work and sees her walking hand in hand with her farang customer.