I think venting about women is completely fine, and having a woman hate thread is justified if we have a man hating thread. Women can be petty bitches that can ruin your life if they want to. And of course they are also capable of appalling crimes that might fly under the radar more easily.
What I find interesting though, is the difference in what's being vented about for men hating on women vs women hating on men. Women tend to vent about men being an actual detriment to their life (bad relationships with e.g. gaslighting or abuse, rapeapes/murder, getting a crazy stalker, tons of men being mysoginistic and resulting difficulty in e.g. jobs/career/life, basically the whole history of mankind). Men vent about not getting pussy, women being "dumb" and yet women still somehow manage tricking them (... to buy them a drink or whatever).
There's a profound difference in the average vent presented. I think by all means women truly deserve to rant about men.