The existence of the institutional racism you described in America in no way justifies the Chinese government's cultural and population suppression policies against minority groups. That whatabout-ism.
It is entirely consistent for me to be against both, but at least we can discuss the first issue here in a US forum on US servers. Try having this same discussion on a Chinese forum and see how far you get.
https://news.ycombinator.com/newsguidelines.html