Because he still feels bad for accidentally taking a swipe at Clark (despite it hardly being the worst they've done to each other, on purpose) (and being the one who ended up with the injury) (and the fact that Clark couldn't even feel it), he does not say that he doesn't believe Clark can sense animal auras or whatever and that he's just being ridiculous, or that his necessary 'consumption' of leather and other animal products that aren't food will always dwarf his diet anyway.

The sad vegan pizza is fine. At least there are no fish.

Also, perhaps going along with the crumbly corn pizza will make Clark less inclined to :/ so intensely when Bruce uses him as cover for buying two awful slushie margaritas. One of which he chugs so fast the painful brain freeze is tangible in the air before he even sets the plastic cup down with a (hilarious) wince on his face.

"You're not supposed to ask that," he points out as he digs a few NSAID tablets out of a pocket. "You're supposed to tolerate my conspicuous avoidance until I crack and say something dramatic."

Pills go in mouth. Second (awful) margarita is swallowed slower this time. He thinks maybe this was next to a bottle of tequila once, weeks ago; it's mostly ice and sugar, and he will have the worst headache later.