It was kind of like asking a Jewish guy to take off their mask so he can see their Toucan Sam beak, except using a less well-known and obvious feature. It was just Crowder's sugar-coated way of saying that he has small and dark eyes, referencing the character Velveteen Rabbit. It's possible that it's just a joke attempt but there's a good chance he knows about the old cartoon caricatures of Nazi Germany anti-Semitic propaganda, which always had black and beady eyes.