Purely anecdotal of course but the kids I met in college who were nerdy and studious and sat out that kind of social jockeying in high school were the biggest jackasses in college because they hadn't gotten any of that out of their systems yet. I kinda think we need to learn a lot of this stuff from experience - we don't learn compassion by being told to be compassionate, we learn compassion by looking back with a more mature perspective on our own actions and how they affected other people. Middle school and early high school made Mean Girls look like a documentary and while it wasn't the best time in my life I learned how to be a much better person from those experiences where I was on both the giving and the receiving end of the teenage nastiness. People are going to learn these things one way or another because we're not all born saints; in my opinion it's better to do so alongside immature peers when the stakes are lower than to do it later on as an adult.
Edit: this is in reply to ksdale, not sure why I can't reply to your comment