Are you claiming you own those dances too?(or just that you made use of another person's work and incorporated them into your works?)
I think the dance is ridiculous anyway and have never done it. As I said in another post about what the most relaxing dance was, it was the Electric Slide because I would get to sit down and relax for a 2-3 minutes while half the people at the studio did it.
For the love of peace and harmony everywhere, ban this guy and send him packing. Of course, he'll threaten to sue you and talk about how he has a "new" lawyer and things are really starting to roll in his favor. Yeah, right.