Don't you hate it when someone points out your so-called "glaring" ignorance or even your mild misunderstanding? Like how was I supposed to know the Hawaiian alphabet has only 12 letters. Ok, maybe there's 13; I still haven't sorted this all out.
That's why there should be (and now is) a word that one could use as a comeback to be said quietly so as to mask that the retort is loaded with passive-aggression. Not that I'm condoning that sort of behaviour. Nobviously.