Well, technically, you kind of do have a right to be an asshole.
It's just that everyone else has the right to call you an asshole, and to choose to have nothing to do with you. Your boss has the right to fire you for being an asshole, your friends and family have the right to cut off contact because you're an asshole, you can get banned from local businesses because you're an asshole.
You've got the right to be an asshole, but nobody else has any obligation to put up with it. That's the part they seem to miss, every single time.