I’ve heard that kbin supports blocking entire instances at a user level

Yes, to do this, go to kbin.social/d/insertinstancehere, then block from there.

I think this is one of the strengths of kbin, because kbin itself can be open and neutral as much as possible and let each user decide the content they want/don’t want to see. Of course this doesn’t stop bad actors from coming over, making accounts, and start giving the instance a bad reputation, making it increasingly likely for it to be defederated by other instances…