I agree with Engelbert - often you see comments like "Oh well, men are just like that" in response to some minor issue (not so much rape and DV though, I hope?) on AIBU or chat or, say, parenting, e.g. in a discussion about whether dads get involved with childcare. Usually there will be some dissenting voices though.
But generally on the relationships board (except possibly the cheating threads, though I don't go on them much) and the feminist board, at least, those kind of assumptions never go unchallenged.