On Tuesday, I had this conversation:
Woman at camera shop: Are you from (whispers) Xinjiang?
Me: No, I’m Chinese-American. You thought I was a Uyghur?
Man at camera shop: Uyghur women are very beautiful, you are very beautiful, that is why we asked you. 
Me: Ummm.

I don’t know what goes on in Chinese people’s minds when they get all wound up in determining someone’s ethnic background.