If you have to ask then you've obviously never seen any of his posts. He was banned for using obsessive foul language, posting warez, and spamming among other things.
Well if rockerslad is IWellKillu/Iluvdrake then he appears to have cleared up his act. All I can remember from the debacle was the stupid things he posted and the funny responses from the admins (until he got an outright ban that is).