Why yes. Yes they do.
Flaming is ok, but calling for these women to be raped and so on is just disturbing and weird and anyone doing it is a bit far from a decent person in any context.
Decent people get caught up in (bad) events all the time. There's the Stanford prison experiment, where students were separated into guards & prisoners with horrifying results. http://en.wikipedia.org/wiki/Stanford_prison_experiment
This probably isn't a good comparison, but it's an example of decent people doing bad things and following a crowd or mob mentality. There's probably some sociology term for it, where "normal" people act in un-normal vile ways.
In this case, many of the commentors appear to be male and got caught up in cussing out women (or were acting like bullies). Someone started it, and it snowballed into vile and derogatory language. I'm not condoning their actions, but things like can and do happen all the time, and without intervention escalate.
From a technical point of view if AutoAdmit had blocked search spiders from indexing their forums (or at least the scandalous ones) none of this would have happened in the first place.