Played with a guitarist a while back who had heard someone make a comment about one of his solos which, to be honest, was a bit sad with quite a few bum notes in there (no, it wasn't jazz before any joker asks)
I understand that no-one likes criticism however, his argument was that the guy wasn't qualified to make a comment as he was not a musician.
My personal view is that if something is not good, it's not good. It's not as if he was playing anything so way out and clever that he could employ the "I think it went over their heads" argument
I believe that if someone is into music appreciation, as opposed to actually playing it, they're more than qualified to say what does, or does not, sound good.