As a rule, I tend to think that any sneering aimed at a famous / wealthy / successful musician usually has a large dose of jealousy included. It can be sneering at playing, miming, performance or complaints about the pressures of life when famous or any of a myriad of topics, but jealousy is usually in there somewhere.
I'm big enough to admit that I have been guilty of it in the past, but these days I wish them all luck. Well, maybe not Bono.