I'm actually kinda with btc on this one.
The guy could have used a lot more tact, but isn't it plausible that an extremely gifted jazz musician, who probably has a fairly high standard of how he envisages jazz should be handled due to his own work in, dedication to and love of the genre, would criticise Kenny G's music for reasons to do with music theory and protecting the work of the pioneers?
If that argument was coming from any old jazz enthusiast hack, I'd be more inclined to write it off as pretentious snobbery, but if it's conceivable that anyone could hold an opinion like that and be half justified in doing so, he would certainly be in that group.
And I'm not even saying I agree with PM. Hell, I've never even heard Kenny G's music.