Pinkie Pie: Yeah! He's the one that made you act super-duper nasty. What I mean is, there are other ways to assert yourself besides yelling at everypony.
Rarity: Yes! You can stand up for yourself without being unpleasant about it.
Fluttershy: I... I'm not sure I can, I'm too far gone. Whenever I try to assert myself I become a monster...
In my opinion, one of the best chapters of Season two.