Christie, your hypothetical is very thought-provoking. In practice, I think the verbal derision on the part of the audience is not likely to spill over into prosecutable disorderly conduct unless other factors are present in addition to an unappreciative audience and an inexperienced musician.

As usual on the web, this post does not constitute legal advice or establish a lawyer-client relationship, etc.

Okiemockbird (a.k.a. T in Oklahoma)