The first thing he did wrong was to sue about an opinion on the internet. The second thing he did wrong was to sue a web forum full of intelligent people who can see through his charade so easily that it's borderline comical. If this case did in fact hold some merit and was ruled in the favor of the plaintiff, it would be setting a disturbing precedent that would eliminate half of the web's content. All that would be left is porn.
If there were any grounds to, I say counter-sue his ass back to the time where he didn't think he could get away with these types of frivolous actions.