"Uh, excuse me?" Kate asks, looking over at him with her eyebrows drawing together. "Yeah, you're totally right. Handsome dudes with successful businesses who are super kind and generous and all that shit are totally gross. Like, the most disgusting. I can't even believe I'm friends with you, I'm so completely revolted by who you are as a human being."

And then she reaches over and punches him on the shoulder. It's not light either, Kate might not be particularly big, but she can pack a pretty mean punch when she wants to and although she's sure he barely feels it because he's a werewolf or whatever, it's still not light.

"I don't know what the hell kind of ideas Stiles put into your head about you not being a catch or whoever else has said or done shit to make you think that, but fuck them." And she knows it's a risk, saying something like that about Stiles, but if Derek wants to get mad at her over it, he can. She'll go home right now and let him be mad at her as long as he doesn't also think it's okay for anyone to make him think he's not worth being with. "That's bullshit."