Pretty much any and all pwnage of Missy and Gordon, no matter how small.
One notable instance: During Cassie's intro, Gordon told her to "learn her place before he put her there with his fists". Cassie immediately put him in his place with a little armchair psychoanalysis. Even the socks she'd previously pissed off with her snobby character bashing thought it was cool.
Syrius rising up and slapping Trisha for insulting Molly. Keep in mind, Syrius is timid, self-effacing and non-confrontational and Trisha is merciless in her bullying of the less secure socks.
Cassie's recent transition from full-time elitist bitch to Jerk with a Heart of Gold, especially during the Syrius incident in which she laid the smackdown on Essie and later Angela for what they did.