Outsult
Noun
1. An insult applied by someone that actually reflects badly on them, outing them in some way.

My favourite recent outsult was being called a "thesaurus trying to impress people by looking intelligent" because I know what words like "hyperbole" and "sardonic" mean.

No, little dude, this is actually just how I talk because I'm well read and literate. Good to know where YOUR bar is, though.