I don't know that this is particularly useful, but my approach was to use humor as a weapon. I figured if people lived in terror of annoying me, no one was going to mess with me. In practice, this worked a little be too well; the editor of the newspaper a year ahead of me (a brilliant, poised, competent and very attractive young woman who was going on to Harvard) wrote in my yearbook when she was graduating, "Thank you for not satirizing me." But it worked. I'm not sure how to convey that to current high schoolers, nor whether one should if one could.