My friend keeps hitting and attacking me and the rest of my friend group violently and I don't want to talk to him anymore.
I have a toxic friend (13H) who has anger issues and regularly attacks me and my friends in a violent way. He's been doing this for about 3 years and we have all put up with it until a few days ago.
Recently, my friend, 12N, made a light-hearted joke along the lines of "I can tell you have Autism" to my other friend 12M outside of school near the bus stop. (Our friend group is made of neurodivergent people) For some reason, 13H took great offence to this and screamed at 12N even though he had been physically violent to M for multiple years while they lived together. N jokingly "responded" You're a tough guy, aren't you?" 13H got really mad at this and charged at N. N didn't see this coming and couldn't defend himself. After this whole ordeal, he was crying and H just walked away.
I talked to my mum and she said that we should stop being friends with him but I don't know if we should just put up with it. Is it 13H's fault that he attacks us because he has anger issues? Please give me some advice.