That is some seriously low shit right there. I don't know how close you are with the guy, but I hope you can help him out, because incidents like this can definitely inspire paranoia and misanthropy. If there's something you both like doing (maybe gaming) then go to some events related to that (like LANs.)

My high school experience was very tame, though I spent quite a few lunches alone or in the library. But yeah I definitely still miss high school and wouldn't call it hell by any means.