@cadence

I'm not sure about that. I mean, your opinion is your own, but I think the main problem with Vriska's lines here is the use of "shit" as a singular noun, which in my experience almost only happens with the insult "little shit" for someone being uncooperative or annoying. Her repeated use of "useless" feels repetitive too, so her calling him "such a useless shit" just comes across as kind of a shambles of a sentence.