No, China is not homogenous.

> racial problems are nonexistent

Ask a non-Han about how they feel about that statement.

You do know that Chinese people do go to other countries and that we all can see how insanely racist they can be right?

During the "diaoyu island" incident in the 2010s the sushi shop 200m near my appartment got sacked, and all japanese-brand car get smashed.

My black (and indian) friends all complained how hard they were treated. And when talking with my Chinese friends they all had very .... interesting... point of view.

Edit: also, I'm not from the US

Riiiiiiiiiiiight:

https://ipvm.com/reports/hikvision-uyghur

Guess they solved all the "racial problems" by deploying surveillance cameras to help shove all the undesirables into camps. /s