Not singling out B.C. here, but… Is it my imagination, or have there been a lot of “Death says ‘Relax'” gags lately? I’m pretty sure we just had two near- identical “Relax, I’m just here for your houseplants” gags.
Unless Caveman-With-Glasses-Who-Probably-Has-A-Name knows as a fact that Caveman-With-Freakishly-Large-Teeth has Celiac disease, why would he care whether he eats gluten?
Basically, cartoonists in 2018 understand gluten about as well as cartoonists in 2012 understood global warming.