This is instantly one of my all-time favorite threads. Many great points have been made and I agree that we tend to overlook the fact that it took many years for society to move to the point where it became "acceptable" for women to behave in a traditionally masculine way. Change for us will absolutely require time and someone to lead the way.
There's more to it than that, though, because part of the problem is simply that it is more acceptable to behave like a boy than it is to behave like a girl. Boys are strong; girls are weak. Girl behaving like a boy? That's a step up. Boy behaving like a girl is a step down.
Sadly, our culture inculcates this belief at a very young age - in both girls and boys. Just take a look at the #LikeAGirl campaign by Always and the filmmaker Lauren Greenfield. It's shocking and sad how our girls view themselves. We've got to stop this, and frankly, manning up and putting on a dress is a great way to start breaking this cycle. LOL