I was at school and I told my teacher I had a Minecraft server. He wanted to know the IP. As he had minecraft. So I gave him it. He told me his minecraft name and said he would come on later, he came on and started using fly hacks and asked to be an admin. I said no as there were already many admins. He got angry and said he would give me 1 hour school detention if I didn't. I still said no and he started using hacks to destroy people's houses. I then banned him and the next day of school he gave me detention for banning him.
Can he do this?