It's infuriating. It's insulting. He's a demon and he shouldn't stand for it, except that it's also just adorable, particularly with that slight twinkle in Aziraphale's eyes just daring him to do something about it.

Crowley casually steals another forkful of food from the angel's plate, chewing it while still looking at him with eyebrow raised high. "Do you really want to taunt the demon who'll be driving you to Scotland?" he points out. "Really? Might regret that. All sorts of mischief I could get up to en route."