What happens if you call them out on it? Like you said is it more of an ignorance thing or even if you know better will they still not give you the lower price because you are white? That would be pretty crappy indeed. This is why it is probably best for me to avoid foreign countries and just stay in my American bubble.
at a government place, nothing. They are government, so under threat of force, they can do whatever they want... just like USA. In a private establishment they will immediately try to befriend you and offer you the "Thai" prices.
Ah, okay. It probably just makes sense to avoid them like you do then.