I grew up in China. When I was little, there was a time that if a Uyghurs person get on the bus, everybody else on the bus would get off. Even nowadays people tend to get nervous when they see Uyghurs wandering on street.

Replace "when I was little" with "1930s Germany" and "Uyghurs" with "Jews".

A seed of distrust and paranoia was sown and was allowed to grow. That does not mean it has any basis in fact.

You should also look at how the Chinese government has oppressed the Uyghurs (and Tibetans and Taiwanese, to name a few).

I know biased stereotype is bad, and I totally agree not all Uyghurs are bad. I went to Uyghurs restaurant regularly and had Uyghurs classmates in college too.

Yep, me too. How could I be racist, one of my best friends is black? I just mean the other kinds.

That doesn't necessarily mean it's reasonable to be suspicious towards an entire ethnic group. Not many Uyghurs support violence, and not all Uyghurs are separatists.