Nobody likes to have their feelings hurt... it's not pleasant. Hearing weak, phony, auto pilot musical cliches that mimic jazz can also be pretty unpleasant. It's not hard to see how people who dig great under recognized musicians perceive a foul stench of injustice when subjected to smooth jazz popularity. Quite a few practitioners are highly skilled and manage to sneak in bits that aren't completely tepid or stale, but most recordings that get trotted out as smooth jazz are sort of like plastic flowers, a waste of petroleum and a poor, (or maybe even a crappy) representation of the real thing. If someone who likes Kenny G or the Yellowjackets says Mingus, Tim Berne or Monk sucks, most jazz freaks would probably just laugh w/no hurt feelings at all.