Here’s Elizabeth Moon’s take:
What literary snobbism does hurt is the public–people who are taken in by the ignorant assertions of “experts” who don’t even read what they claim to despise (or read it so carelessly that they might as well be reading a cereal box.) It hurts the students who think their natural taste for plots that are plots and characters who are interesting is the literary equivalent of original sin and must be excised before they’re fit to be called educated.
Anyone who thinks there’s no “complexity, depth, and originality” in commercial fiction needs an education. Anyone who thinks mysteries (or any other genre) are all “trashy” needs an education. (Start with Aristotle, whose _Poetics_ lay out the criteria. Continue through centuries of fiction that worked, up to the present day, being sure to take in multiple genres in each era.)
[via The Swivet]