Eh, the real counter argument isn't about their beliefs. That's fine. Most of it is sound logic.

The problem is their insistence on not only being right, but being better.

The part that makes it silly is the assumptions that chain from there being a right and wrong about what we do with dead animals. It's a corpse. What matters is how we treat the living animals, and they are utterly convinced that not only is their way the one true way, but that anyone who believes otherwise is a bad person. I've been using this troll for something like a decade, and it never, ever fails to draw someone throwing around terms like evil, heartless, cruel, psychopath, etc.

That's the thing to counter argue, not any of the ecological stuff, or the need to treat living things well.

That assumption of moral authority is the point of the troll.