Corporate is really Unfair to guys

This really sucks, in my office majority staff are girls and middle aged women, there are just 4 of us guys one of them is middle aged. In a 10 to 6 job the management allows ALL the female staff to leave by 6:15 or 6 saying that they are "women". Like Wtf man, and the 4 of us guys are left to clean up their stuff in addition to our own work. We routinely leave at 7.45 or 8.15 and everytime we bring up this issue to our management it's brushed aside saying that we are "guys" and that we should be more mature and responsible. The worst part is that the HR keeps hiring girls and most of them don't even know basic MS office!!. I mean hire some competent GUYS for fuck sake if you want a more "mature and responsible" attitude. This isn't a rant against girls and it's in no way intented to insult any girls. But it's absolutely UNFAIR on the part of management to put us guys through extra 2 hrs of work just because we have a dick.