I am here to quite support what was said by Baé.
That guy just joined and started to neg rep people on Artist's Corner saying the neg rep stuff was a soap opera or something. Look, this happened the same day when he joined and he's not a member there. It should be obvious why there's a suspicion here, plus there's proof it's him. We, from the Artist's Corner, have plenty of reasons to believe it's the same guy that have done that before, since "that other person" was on neg rep spree on the Artist's Corner, repping every other member. He did gave some advice through it though, and that sort of behavior, doing it to help, is perfectly acceptable, but what occur is, it discourage people from posting there.
People can go and report the rep, sure, but you, me and almost everyone know this stuff doesn't and never worked, since you have plenty and plenty of people saying how they are neg repped recklessly and the "report" feature doesn't work. A guy had send me a VM saying I could report his neg rep because it was intended to be a positive rep. I talked with Ellie and the neg rep is still there, despite I had proof and had sent her the link to the VM.
Plus hundred of MODs saying there's nothing that can be done to other users.
Kaiserin also said she talked with a MOD/ADM once, twice and I believe there had a thrice and now may have a fourth time.
There's not any way to put that person a "special" usergroup where he can't give rep anymore (and I think there is this feature, because I work on another forum as an ADM and we do this with problematic users, plus it's vBulletin, just like here)? It'd certainly deal with people abusing this feature.
Not a rant though. I just felt to say it. Sorry for this rather long post, hehe!