What would you call the places where the US detains immigrants? What would you call the enhanced interrogation techniques the US uses in guantanamo bay and CIA blacksites? What would you call the prisons where the US forces people to work without pay?

The US has used heavily militarized police and even tanks to crush civil unrest. The US doesn't just threaten to invade a neighboring island (like china threatens to invade taiwan), the US actually has invaded neighboring islands such as Cuba, Haiti (multiple times), the Dominican Republic, etc. None of this justifies any of China's actions, but it is important to know that nominally democratic nations can also act authoritarian.

Exactly. Chinese capitalism is currently threatening American capitalism, so American media and american society more generally demonizes it. China is willing to offer cheaper loans to 3rd world countries than any western countries and banks like the IMF. Of course, this is still exploitative imperialism, but it is slightly less bad than the west. China. Of course, China treats its workers terribly, but it at least tries to reinvest the surplus it takes from those workers into domestic production and infrastructure. Tankies love to depict China as ontologically good because it opposes american hegemony and has a rapidly growing economy. They ignore its imperialism and domestic exploitation. Redditors, American exceptionalists, and their ilk depict China as ontologically evil, a threat to world peace, the most totalitarian country imaginable. They of course ignore the comparably bad conditions of America's puppet states and its domestic prison system. The reality is much more boring. Two capitalist nation states are fighting over their shares of the world market.