Not sure if this has anything to do with it, but Lemmy.ml is moderated by communists, and I don’t think they get along with libertarians.
To be clear, "libertarian" originally referred to what we would now call anarchists, or anarcho-communists. But at this point, the word has been pretty completely coopted by those on the right tending toward the very different ideology of anarcho-capitalism. Statist communists and anarchist communists have their own internecine conflicts, but both hate the current right wing libertarians.