I'm basically tattling on a dude to his parents
What did he do?
I don't want to listen to his crap anymore, giving him a hard time will teach him a lesson
You should just confront him yourself. His parents can't control what he does outside of the house and away from their supervision.
That would be too hard for me, plus I don't want them to think bad of me.
Try to get him to leave you alone then. If it doesn't work tell the parents as backup, you don't need to be harassed.