Bullying does need to be treated as criminal offensive in many cases. Student beats up another? Arrest the little maggot and charge him with assault.
School administrations also need to stop zero-tolerance policies and not punish students who are trying to defend themselves from said bullies.
... like saying there should be Castle Doctrine practiced at the person level
I agree. On the other hand, if a student says, "I think homosexual behavior is a sin, and not only that, your clothes and makeup are absurd," the "victim" should be able to respond, "Who cares what you think?" and get on with his life.
That policy is widespread. I was defending myself after a bully suddenly jumped on my back, slapping my shoulders hard. He was not a friend and had attempted bullying me verbally before. I was sent to the principal's office for fighting. The principal said the bully said he was only joking and warned me not to fight again. I replied that I wouldn't fight again if he left me alone. I have no doubt he was doing it for his own amusement but not mine.