Affectionate shortenings and things like that are one thing. It's easy enough to spot when someone is modifying someone's name in order to be aggressive. The point I was trying to make is that it's the kind of behaviour that invites aggression back. I don't often see the mods stamping down on deliberate misuse of chosen or real names (and I reiterate that I'm not innocent). It's a sign of a less than perfect ethos and we'd be better off without it.