Karen didn't flinch one bit. She wasn't being insulted, per say, but some unknown classmember of hers called her out, and she was going to strike back, hard. She didn't move from her seated position at the table, but the air around her cooled back to normal temperature. Ironic, how she was about to roast him. 
[color=red]"Because, idiot, just because you [i]can[/i] do something, doesn't mean you should. The tests weren't to test our limitations, they were to test our reliance on them. Obviously a sickly cripple like you needs your quirk to live, but the rest of us don't. And for all you know, I [i]could[/i] have used my quirk and it [i]could[/i] have done something to alter my score, but I didn't. Now sit your frail arse down before you have a heart attack."[/color]
And with that, she dismissed him more or less with a flick of her head towards him, followed with a piercing stare that could freeze a person. Again, ironic. She then made a 'Tsk' sound, and looked away, eyeing Raven, since she was still somewhat angry at her for speaking. Her arms remained crossed as she dropped her eyes to the table, then closed them. This day just got a little bit more interesting.