[It isn't sarcastic, which is why Dirk doesn't snap back. Instead, he tries to find a way to articulate it. It's surprisingly difficult, when he usually has words for basically everything.]

I hurt people without being angry at them or attacking them. I'm obnoxious and condescending, and I push my own desires about how people should be on them, and I make them feel like crap. Or I force them to fight unwinnable battles against stupid robots that look just like me in a twisted idea of courtship while claiming it's helpful training, which is definitely worse. That's a universal constant across every iteration of Dirk Strider that ever is or was: I'm a dick who hurts people and acts like I know what's best.

This is just that same toxic, horrible personality slipping out in a really obvious way. Anyone who already knows what I'm like would identify it instantly.