It wasn't that they didn't appreciate, it was goyish, treif, and needed to be removed entirely.
Yes, that is what some people thought. It obviously wasn't what the concert organizers thought.
(I disagree that it was treyf when he was frum).
+1
Personally, I couldn't stand the stuff. Moreover, and this should've occurred to the organizers, it was very DIFFERENT than anything else they had featured, and this should have given them pause.