There's a fine line between not liking something going on in the US, and turning around to do a full 360 and adamantly supporting a state and its practices when those practices involve regular and very strict authoritarian censorship, state control of society and media, the total subversion of basic human rights protections like open courts and democracy.
From what I've seen these people are very much on the other side of that line.
That isn't supporting China or supporting genocide or engaging in genocide denial.