I hate when people think I am bad.
What kinds of things bother you?
One of my ex boyfriends used to call me a bad girl.
People have a tendency to judge other people, just because someone called you bad all the time doesn't mean it's true. You shouldn't be bothered by other people's judgment because they probably trying to piss you off on purpose.
It still bothers me.
Well not everything other people say is true. If your relationship ended on bad terms I can see why he might think that. The best you can do is be your authentic self and move on.