They want all m/m fans to grovel before them admitting they are mere brainwashed tools of the patriarchy and only f/f writers deserve praise. Obviously.

(As nonny above said, it is possible for people to expand their horizons and learn to love other things, and honestly I think fandom as a whole *has* been and it's great. So many fewer exclusively m/m spaces and fans than there used to be! But this is not the way too move that forward.)