People who whine about full looting.
People who whine about descriptions.
People who need immortal interaction to have fun and whine if they don't. The game is about player interaction.
People who need to micromanage and powergame to have fun. And then come to the conclusion they aren't having fun.
People who don't realize MUD stands for MULTI USER Dungeon. Not antisocial text based gaming.
All the weird ass russian Gnome shifters who talk like Borat. Whats with Russians and gnomes anyway.

I started playing after a 7 year break, Hero'd, Cabal'd and just got bored really quickly due to most of the playerbase (exception of a few) and stopped playing.
I did however like the newbie Arial who sent tells to other Arials in chicken speak "bukawk" and let's not forget the Necromancer (the player was on crack) I grouped with who believed a thief was stalking him in the wilderness and kept running around faerie fogging for like an hour. Comedy.