As a vegetarian (which I define as anyone whose utility function contains a negative term for eating meat), neither of those are true for me.

Just to clarify, do you assign negative utility to just you personally eating meat, to the total amount of meat being eaten by every human, to all animals killed by the activities required to feed the human species, or maybe to something else? Or maybe some weighted average of all of those?

But the author commits illusion of transparency when ey assumes that animals that move slowly and are slothful are the "stupidest".

I agree, this comic would be rejected by a peer-reviewed journal.