Female supremacy is a real, serious thing. It's what happens when radical feminism and femdom BDSM play chicken and neither swerves.
They're fun to argue with though. All their arguments are just foo supremacist mad libs, so it's easy to argue the exact opposite and be just as persuasive (Which is to say, not that persuasive at all, but you get the idea). With the right technology either sex could turn the other into a sterile, subjugated underclass, but either way will never happen because this isn't Gor.