If you payed closer attention you'd notice that we have a range of opinions on China, and we don't all think everything they do is correct. That's what the term critical support means. It's a recognition that even socialist states are imperfect, as the nation state as an institution is fundamentally imperfect and will always and everywhere undermine freedom to some degree. But a state which is undergoing the transition to socialism, particularly one that's putting themselves in a position to undermine US imperial hegemony like China is, is well worth supporting, even as we acknowledge its flaws and contradictions.

What none of us will ever tolerate are accusations of genocide with one discredited religious fanatic as the source, or racist insults being hurled at their head of state, both things I've seen numerous times from users from other instances.