Obviously it’s easy for the nonwhites, because they clearly like moving to white countries, neighborhoods, school districts, etc.
I don’t see much evidence of the reverse happening except in tiny numbers (there are more Chinese in my hometown of Seattle than there are white Americans in all of China). And despite the tiny numbers of whites in China, a very vocal contingent of Chinese still throws fits about it.
So no, I don’t think I learned what it’s like to be a nonwhite in white society during my stay in China, because it’s obviously far more comfortable than being white over there. This is why I’m certain that most long-term expats must really like and appreciate China. You’d have to to put up with it for that long, or else you’d have to be getting paid a whole lot of money for living there.
As for the Sinicization issue, I live near Vancouver BC now, and it has definitely Sinicized. So have parts of California. It is not a welcome development to most Anglos when they find their children priced out of their cities and shoved out of the universities they built.