It's all very good to talk about the state of civility in games, but when it comes down to enforcing it, that's always worse. Is there some special case for mysogynists. I don't see it. How are they different all the other idiots.
There are different levels of interaction, when one is anonimous and brieftly interacts with someone one never expect to see again some people indulge their baser instincts. Don't be overly offended, that person is probably just letting off steam about something else in an environment where he can get away with it.