This is pretty explicitly the type of speech that doesn't need protection by 1A. The absolutism of it is really an ideal that practically achieved would lead to some ugliness.

But I'm wondering how this extends to banning conservatives, conspiracy theory pages, or even jokes? When is it going too far over the line, which is drawn at different points for different people/groups?

Because my fear is the government doesn't crackdown like 1984, but the public is convinced there is a much broader definition of wrongthink that people call each other on, leading to less creative expression even if it's offensive (with context) and essentially the same as CCP limitations of speech. For instance I think we're mostly over the days of racial one-liners that are just dumb and play on stereotypes, but how do we convince people still thinking those jokes are appropriate to cease using them? Education and compassion may help in some cases but not all.