The thought of banning an idea that really, is actually harmless, is shocking. If people want to spread their messages through non-violent means, they are entitled to, no matter how stupid and ridiculous that message is.
This applies to misandry, not feminism. There's some overlap, and that overlap is (imo) where the problem is, but hate speech does not ban feminism in the same way that hate speech does not ban the gay rights movement.