[The strang thing is, he doesn't exactly disagree with what Alex is saying here. But he does feel like he finally understands what it is about Alex's approach to things bothers him so much. The world is a shitty place, he agrees with that, of course. The rest of the statement, though. Maybe it's whatever's lacking in him that makes him incapable of taking on that sort of attitude. Of refusing to just sink into nihilism.

He realizes he's jealous of Alex.

And he hates that.]

Out of spite, mostly. [He knows it was a rhetorical question, but he's answering it anyway.]

Most people I've met would prefer a world without me in it, so if I'm going to stay alive for anything it's to make them miserable.