This is nothing more than the age-old snotty attitude held by those on both sides of the equation who have small minds. I think some of it is fear, and some is just plain ignorance...sort of a "prejudice" kind of thing. When the two cross-polinate, then you get the GREAT stuff- the Belas, the Grismans, the Rowans, etc. I went to a Bluegrass gathering in the park two weeks ago, and a bunch of those hard core dorks were there, as always. Once we played for a while, the open minds split off and had a great time- the hard cores stood around trading licks on "Way Downtown". It has ever been thus.