If you don't critically support China, then in practical terms you are for the continued status quo of US imperialism. Unless you show me what is more effectively undermining US hegemony, then there isn't really any other way around it

This is not even a proposition of whether or not China is socialist. This is about what is the most destructive barrier to human advancement. If you agree that it is the United States, then how can you not want this barrier to be challenged in all possible facets?