School teaches a whole lot of things, not all of them what the local teachers' unions want taught.  Some of those things are:  Positively interacting with people who may not agree with you.  Yeah, there's a whole bunch of things that are illegal and/or immoral, but one learns some good stuff.  Maybe something as insignificant-sounding as allowing those who don't come forward and interact much, to do so.  
One thing I have noticed--the "cool kids," the "popular crowd," they tend to have their zenith in high school, and spend the rest of their lives trying to get back to that point.  I realize that I went off the rails here with this last part, but I learned it, and I figured that I had to share it.  (No, I was never one of those "cool kids."  I was a geek, who went in the Army.)