"Incompetent" and "Ignorant" normally gets peeps going pretty good
I especially love the players who "System RP argue" that use things that normally 9-17 year olds would most likely use ("Your mom" "Suck it" "Baby" etc). Then I play the whole "Ah you must just be fat, chip munching, 14 year old who got a-hold of his father's ship coms. Sitting all cozy in front of your transmission monitor, fingers greasy, glasses smeared, room cluttered, only capable of cave man intelligence level banter." That can sometimes hit home a little more than needed.