Earlier quoted context omitted.
This could also be described as being cliquish, or an echo chamber.
I've found Tildes to be welcoming to a wide variety of ideas, opinions and world views. We're hostile to trolls, saboteurs, personal attacks, self-promotion and repeated empty or trivial junk comments. If it's cliquish to discourage activity that makes social spaces miserable, then that's the kind of clique I'd like to belong to.
Its unfortunate that some social spaces are uncomfortable with divergent viewpoints.