"I never said that jazz was at the root of Appalachian Music" - so why should M Ted describe Captain Birdsey's comment that ""jazz is not at the root of the old APPALACHIAN MUSIC" as a rebuke?

All the Captain said was that he didn't much like some of the music that M Ted does like. That wasn't a rebuke. Musical tastes differ, that's all. That's why there's a Mudcat in the first place.