Be yourself!!

Why is it when a group of men get around a group a women they start acting like a bunch of high school friends. Now dont get me wrong i love my friends to death but why is it that everytime we go out its always the samething, one of us is snappin on somebody else,one of us is acting like he can beat everybody up and then theres the one thats mad because he doesnt have the heart to talk to anyone. Why cant they just be themselves?