I think in a lot of cases someone like Kenny G is just an embodiment of general negative feelings towards a certain type of musician i.e. one who is perceived as having 'sold out', by a certain type of listener or other musician.
Back in the late 60's Marc Bolan was a favourite of the underground/hippie movement, but became reviled by them almost overnight when he 'sold out' by strapping on an electric guitar and having hit records. This kind of attacking 'uncool' musicians by the 'hip elite' is nothing new.
Probably, Kenny and his mates make similar disparaging comments about more 'experimental' artists and their lack of sales, maybe on a website with a forum called The Sushi Bar. I remember, back in the 80's, populist DJ Steve Wright was forever taking the p--s out of Morrissey which is roughly similar - the mainstream deriding the new or different is nothing new either
What I'm saying is, it seems to be part of human nature to place your own group, beliefs etc higher up the 'pecking order' than those on the 'other side'. We need to feel we belong to a group with similar beliefs and tastes, and attacking those outside our group reinforces our own beliefs, tastes, or in extreme cases, prejudices.
In short, there's always been this dichotomy between the artistic and the commercial, with supporters and detractors on both sides. So long as this is done in a relatively good-humoured and good-natured way, with no personal attacks, I see this as being pretty harmless.
So long as you don't say 'you, person A, are a pariah and also evil for being a fan of performer artist X'.
In effect, Kenny G, or from the other side, free jazz, or in my case the Scissor Sisters (yay, shoe-horned 'em in there) are only a symbol really - it's ok to rip the 'p' out of something I like, I won't take it personally, just don't attack me personally for liking something you don't.
In that spirit, perhaps we can all lighten up, if we need to, or be less nasty if we have been. Otherwise, learn to take it as well as dish it out in the intended spirit. Now, shake hands.
Bob Green, Ministry of Truth and Reconciliation