[She's not wrong. He always feels most comfortable when he can push against someone, whether through friendly banter or angry shouting. Vriska's refusal to lash back leaves him off balance, unable to vent his feelings the way he wants.]

...Of course I feel guilty. [And so, he just deflates. What is even the point of yelling at Vriska if she won't return it in kind?]

We're not the good guys here, Vriska. It might not be our own fault we're stuck in this situation, and it's not like we can do anything but play the part we've been given, but... that doesn't make it any better.