Once I decided to make a temporary brick to see what events a server had. I had only subconsciously absorbed that there was a flash grenade spammer on the server. I got banned ("Found your spamming ass!" or something) permanently, and told the idiot who banned me that I was looking at the events on the server. I don't recall what he said, because this was some time ago, but it was something like "I don't care".
As luck would have it, I 1. had saved just to see all the spam other noobs had made ("good Lord, I HAVE to explore these further...", and 2. remembered the idiot's ID.
Brick menu on 1 player Internet server rocks all your retaliatory banning purposes.
Also, I hope that the spammer doubled his efforts.