I do not myself like /r/TwoXChromosomes, and I don't think that it was a great idea to make it a default sub on Reddit back when that happened -- IIRC the rationale was to try to improve Reddit's appeal to women. But it's...kind of a bitter, angry place, and I don't think that that makes for a very good default experience for new users.
However, I certainly think that people who want that environment should have access to it. I mean, people need to vent about stuff. So, hey, good to have it as an option for people.