OP, I totally understand how you feel. I wish I had your courage when I was younger. I think the best solution to this would've been to continue to ignore him though and refrain from calling him names. Remember that anger never solves anything. Someone will get hurt. I learnt this from experience.

I'm also not sure whether your friends are worth your time or not. You should let them go as soon as possible. A true friend will stand by you in times of need, but as far as I can see, they didn't even help and even encouraged your violent behaviour.