what to do with a ex friend?

[bigmeanie18]

I need some advice.I have a ex friend use to be good friends but he got upset over a.comment I made abt a.truck of his and since then he's been trying to start fights on facebook with me and a friend of mine.when we would hang out and get together with his friends he would always argue with them when he thought he was right. He is always arguing to show how he is right and knows more than anyone else he claims I bad mouthed him in a comment when I never said anything abt him personally. I feel he doesn't allow other people to express there opinions with out him getting upset over them.