If we're saying that China has "conquered" places like Tibet and Xinjiang then surely the United States has done much worse to the entire land mass it occupies. But honestly, I'm very much opposed to nationalism so I'm not interested in historical claims, even though China's historical claims are much much stronger. What's relevant in both cases is that the United States and China both have both de facto and de jure control over their present territories.

> Hong Kong

Did India conquer itself when the British returned rule of India to Indians?

> China's CCP has been pushing out immigrants, and fostering racist sentiment

It's a little more complicated than this. I think the level of racism at both the state and individual levels is similar between China and western countries, although it may manifest in different ways.

Hong Kong did not, and by all indications does not, want to be Chinese. Talk to a few Cantonese Chinese in Australia: they especially do not want it. Tibet did not, and by all indications does not, want to be Chinese. Xinjang did not, and by all indications does not, want to be Chinese.

I hate historical claims. There are disputed territories less than 10km from where I live, and if at all possible, I'd like there not to be a war here. I doubt there's many places where that's not the case. I know there's some, but not many.