I believe you're misreading their posts. In the text that you quoted, they say, "I think f(X) and g(X) both exist. I think that X is actually two populations: Xa and Xb."
You've quoted this to say, "if you don't think g(X) exists then why did you post??"
(f(X) is men who want friendship, g(X) is men who want sex, Xa is men in feminist circles, Xb is men not in feminist circles.)