Bullying behaviors are learned from educators, parents, and the media. I would ask that school personnel examine their own behaviors. Bullying is often systemic. Boys (and girls) who are angry with the system often become bullies to draw attention away from the real issues, which can be related to academic failure, learning disabilities, home issues, etc. As a former bully once told me, “You make people respect you in one way so they won’t disrespect you in another.” That gentleman was dyslexic.
Considered a guru on the subject of bullying, Dan Olweus wrote a book called Bullying at School: What We Know and What We Can Do. It is probably one of your better sources of information. I would also recommend Barbara Coloroso’s book The Bully, the Bullied, and the Bystander.