I think musical snobbery does exist,it appears when people think they are supporting the ARTS, these people have usually very little back up but talk at length believing they are quite knowledgeable.
I believe in their musical genres there are people like us that will give any music a fair hearing and make an informed opinion. In the UK we struggle with the mass media who likes to ridicule folk music and dance (although that tide is turning) so uninformed people jump on the bandwaggon.
Keith