I'm sure most of us are all for equality between the sexes, but (I think) so was most of feminists (in actuality, not just in words) at one time. What happened with feminism that made it into the (largely) negative force for equality that many of us perceive it to be today? - And more importantly; how can MR keep away from the same pitfalls?

What are the negative sides of contemporary feminism, and how can we avoid that they plague also the future of MR?