Women are Bitches

Okay, so maybe the title is a little harsh. This post wasn't triggered by anything in particular, it's just something that's been on my mind lately that I wanted to address. My sister-in-law (we'll call her Spiderteen) is a sophomore in high school. She's having some issues with the girls there. She's pretty, smart, sporty, good at just about everything, and thanks to having two older brothers comfortable with boys. Of course some of her peers are intimidated and threatened by her. They're starting rumors and generally being bitchy. From my past experiences, I can totally relate and this upsets me.
When boys/men fight they punch it out and the problem is resolved...they go shoot some hoops. When girls/women fight, they set out to systematically ruin your life. They are manipulative and say some of the most hurtful, spiteful things. Studies show (I remember reading them somewhere, don't ask me to be specific cuz this isn't a research paper) that this behavior starts even at a very early age. Preschool age. It's appalling!
As women, we struggle so hard to get ahead in this "man's" world and it's never going to happen as long as we are sabotaging each other. We need to get past this. Girls who behave this way are growing up and teaching their daughters that it's okay to behave like this. The cycle continues on and on. At some point we have to stand up and say THIS IS UNACCEPTABLE! We need to stop the backbiting ourselves and teach our daughters to do the same. If we can't do this, we really don't stand a chance. We'll continue to get paid less than men for doing the same job. We'll continue to get condescending pats on the head whenever we try to "think" too hard, and we sure as hell will never see a woman as president.
So here's my question: Who's with me?