I know the poster you're talking about. Really weird / creepy guy with literally dozens of aliases. He makes foolish posts until people react negatively, then he becomes flamingly angry.
He seems to be behaving himself ok so far on KP's forum... He's been characteristically foolish, but hasn't gotten hostile yet. I see that he's been mistaken for the real pro-windsurfer Robby Swift, though, and hasn't corrected the mistake.
People that know his aliases should just keep an eye out, I guess.