Hypocrisy and non-reciprocity of dress codes, jokes etc. The point, which should be gob-smackingly obvious, is that what's sauce for the goose should be sauce for the gander too a.k.a. what goes around comes around. I am entirely happy with outrageously sexist jokes like the endless "Why beers are better than women" just as long as the place where they are told also gets the "Why cucumbers are better than men" group too - e.g. this place. Likewise if you insist that 50% of the human race must dress up special to (not) tempt the other 50% and not vice versa then there is a problem.
Update: The commenter "Shouting Thomas" on this post is precisely the sort of moron that makes me want to sign up to as many feminist causes as possible - and the plight of women in that part of Africa as described in the post is yet another reason to be on the side of feminists - thanks to Baron B at the Gates of Vienna for the link
I despise l'Escroc and Vile