Okay maybe I just don't know anything but how is nepeta derse and Vriska prospit? Shouldn't that be switched?

Here.

But then there can be oddball designations that don’t seem to make sense by such simplistic parameters, like Vriska being on Prospit. If she and Nepeta were swapped the criteria might seem more clear cut.

This is deliberate on Hussie’s side and he acknowledges as much.