...was mentioned by Richard Sudhalter in Lost Chords (p. 298): It was " . . . hyped to death as good time party music by the promotional machinery of journalism and public relations. It takes only a brief look at the covers of 'Dixieland' LPs issued in the late 1950s and early '60s to see the result; straw hats and candy-striped blazers, such album titles as 'That Happy Dixieland Jazz' and 'Dixieland My Dixieland'; breathless sleeve notes likening bands playing this form of jazz to barbershop quartets, Stanley Steamers, and Fourth of July fireworks displays."
Even if the music itself had been good--and it was by no means all bad, especially where the soloists were concerned--that would have been enough to discredit the word Dixieland for younger listeners especially.