Yeah, agreed. "Just stop thinking like that" is terrible advice for someone suffering depression (or etc). Especially with the added spice of "and also you're a jerk."

I do think there's a good point here that these patterns are self-reinforcing, and that there can be a kind of counterintuitive pleasure in really getting down into the muck and living there. See also Notes from Underground. But the snide and aggressive tone here is really bizarre.