Whats the right way to call someone out on their pive aggresion?

Plan a total put-down, then do it in front of the largest number of your group that you can. Completely devastate him. Some people just need to be hit on the head with a BIG sledge hammer before they notice. But make sure it's devastating enough that he'll be walking on his jaw for a week. You don't want him to get up after you hit him. (It might be the biggest favor you can do him - it might wake him up, and turn him into a person people actually don't mind being near.)