1) Karkat was not allowed to be so stubborn that he drove himself to whatever maddening end came to trolls who didn't slumber in sopor slime for weeks -- that might explain the faint aftertaste in all his words and actions lately. I mean, he can be crabby, but this was kind of a new record for him.
2) He did not just insult the fact that she's been trying to network and find people who could be manipulated coerced into helping the trolls find their way back home -- even if all the useful ones just ended up fucking vanishing on her.
and 3) Karkat is hers to throttle.
It really is a shame that Terezi doesn't give a fuck about causing a scene. She drops the plate, the shrimp-laden paper making a wet sound on the floor, and even crunching under her heel as she steps forward and grabs PM's wrists.
There's something about her smile; the way her voice hisses out from between her teeth, but anyone else looking might think the pair of them are just trying to adjust Karkat's shirt, and Terezi is just teaching the carapace person how to do it properly. ] You're going to let go of him, and we're going to leave now~~