I would expect some minority groups face discrimination in China, like I'm not a fan of what China is doing with the Ughyrs (referring to what the Chinese government is claiming to do, not what western countries claim to be clear). Despite that, it doesn't justify US reps from supporting movements that would further US imperialism in the global south. Just like how the Hmong people have faced discrimination in Vietnam but leftists shouldn't support American gov backed independence movements in central Vietnam. It's more useful for western leftists to focus on building better conditions here than pointing out flaws in countries that oppose American imperialism.