The world is not well-equipped for dealing with people like this. He’s clearly a cluster B personality type, and desperate for attention. Good attention, bad attention, it doesn’t matter. This is reactive abuse, as he’s trying to provoke her to get a reaction. It may sound lame, but the best way to deal with this type of person is to completely ignore them. He is a child begging for attention. Don’t give it to him. Whatever he does should be viewed as trivial and be ignored. As he continues his concerted efforts and gets absolutely no reward for it, it will make him feel insignificant and look for his thrill elsewhere.