There are more than few differences between the genders, but the big one, in my experience, can be summarized in the phrase "You go girl!"
Despite the fact that, from everything I've ever seen, women are vastly more competitive with each other than men are, women are basically validation sponges. Female peer groups engage in a perverse system of saying "You go girl!" to each others' faces while constantly knifing each other in the back.
Men are almost the complete reverse. Male peer groups basically brutalize each other face-to-face while secretly being supportive. Men will beat each other down for laughs, but when there's really something at stake they can pull it together and cheer for each other in order to accomplish something.
Consider this scenario for each gender . . .
A friend has had a long sexual drought. You haven't. Someone hot comes along and the friend is clearly in with said hot person.
How does this play out if you and your friend are men looking at a hot chick? Men will pull together to ensure the guy in the drought gets the hot chick, by hook or by crook.
And if it's women? Fuck you, pig-friend, and fuck your drought too! The chick who isn't in the drought is going to torpedo her unfortunate friend with everything she has in the hope of taking the guy.
In truth, this is why men run the world. There simply isn't anything close the idea of Man Law on the female side of the equation. Guys look out for their friends. Hell, I've passed on sure ass just to let guys who were more of acquaintances have a shot. There is a Bro Code. There is no equivalent Ho Code. The female view is basically "fuck you, darling, I have the goods and I can get the guy".
At the same time, women are constantly sponging adulation from their friends. In fact, every female peer group has a queen bee whose sole reason for being is to soak up support. And the friends around her take their lumps in order to be "in" with one of the cool kids. The great female fear is being left without peers, even if it means being eaten alive on a daily basis by some group of vile bitches who are secretly cheering for you to fail. Somehow, apparently, enough "you go girl" cries make up for those wonderfully specific moment where some bitch will take your man.
And that, at the base of the problem, is the difference between men and women.