You appear to be under the misapprehension that trolling requires that one not believe in what one is posting. This is incorrect. You can be perfectly sincere in what you post, and still be trolling. Posting what he did in ATMB, in the manner that he did, indicated that SlackerInc was trying to get a rise out of people. That may get by in the Pit, but not here.
In any case, if SlackerInc was actually sincere in what he posted, there would be grounds for considering it hate speech, or at the least extreme bigotry. We were actually giving him the benefit of the doubt by labeling it as trolling.