Why not just get the player's name and report him to Nimmy? He's still the one in charge of the serverlists if I recall correctly. I doubt anyone else on the forums can be of assistance here, and sending a PM to Nimrod will make it more likely that he sees it.

I doubt he'll just ban anyone by request though, try to get at least a screenshot and the player's IP. But even so, I doubt anyone will get banned for insults. If that were how things worked, about three quarters of the community would've been banned by now.