I don't really use names, mostly just phrases of insults.
"I've seen warrens better looking than you"
"You should lay off the Rice. I see your folds flapping"
"Sorry, I don't have any designer jeans for you today" - This one is reserved for GC.
"Oh I'm sorry, you mistake me for someone who gives a crap about your demands."
"You belong to the who?" - Reserved for people who belong to factions with absurd names, E.G LWB"
"Gaijin" - When all else fails.