When someone calls you in reference to employment, it is illegal for you to give me a bad recommendation as I have consistently performed my duties and even more. The most you can say to hurt me is, "I prefer not to comment." To keep you honest, I will have friends randomly call you over the next couple of years, because I know you would be unable to do it on your own.
Actually, no. He can freely tell anyone that calls that you're rude, arrogant, and belittling solely on the basis of this letter.
The other two are pretty clearly blackmail (or more accurately extortion).
Anyway, I really didn't find it that funny. I've seen enough similar wankery by people who think because they know a bit about computers/biochemistry/the law/business they're entitled to act like a complete prat.