It's generally easier on the kids in Thailand, I think, because mixed race couples are more widely accepted there than in Japan/China/Korea.

I did a few years teaching ESL in Seoul and out of hundred kids, there were just two siblings that were mixed race - Korean mom and American Dad.

Even though these two kids looked basically Korean (except their hair was dark brown instead of black) and spoke fluent Korean, I was shocked that some of the other kids in the class referred to them as 외국인 (foreigners), the exact same word they used to refer to me as white man.