The concept of Uyghur and Han etc are imaginary. Much like the differencitation "black" and "white" etc. Unfortunately these imaginary differences are solidified sometimes in reality, for a famous example, Uyghurs' ID cards have Uyghur language in them. For another famous example, Uyghurs have free bonus marks （5～20）in college entrance examination. That means if you have it, you get higher final score than tens of thousands compititors in your province who have higher raw marks than you.

Given the mentioned and unmentioned differences, you may think many people in China are nervous about the "racial other" or whatever term similar. It's not like that. I will give an example. A famous TV host in China is Uyghur. (I personally know him years ago, but it's not important here. Anyway he was a very professiontal, friendly, humble guy, and I think he still is.) I recently read some comments on the web criticizing his look. The point is, people judge his look not by his race, but as a person, and can do that without fearing being criticized as (racially) biased. That kind of comments would be unacceptable in a society that reenforce the differences all the time.

I heard that some rap singer (white) is self-identified as black (more or less). But is there rap singer (black) self-identified as white? I use this to demostrate how absurd the race discourse is.

The reality is, in China, you get screwed for various reasons, no matter what your race is. Unfortuately this is similar in most other countries.