Everybody's favorite bow-tie-wearing polemicist is at it again (and thank goodness, life was getting dull). Do check out Roger Sutton's latest on his Horn Book blog. The killer quote: "Whatever whoever chooses to read is their business, of course, but adults whose taste in recreational reading ends with the YA novel need to grow up." (Please read the rest of the piece, though. He makes some interesting observations before he tosses his grenade.)
For my part . . . Sure, fine, whatever. I finally got around to Zadie Smith's On Beauty (liked it, as I have her others), so I guess my grown-up card is stamped for a while. But, Roger, aren't you assuming that "YA novel" has some objective, useful meaning for readers beyond a bookstore and library category? I think this assumption is both faulty in practice (as evinced by the number of books whose YA labels are gained or lost according to where they're sold, e.g. Markus Zusak) and dangerous in principle because it casts readers as passive, uncritical recipients of categorized books (like Moby Dick is a fish story; Jane Austen is the first romance novelist). No thanks. This is a dumb, reductive way to read. Genre and age category labels exist largely for shopping and shelving convenience. Beyond that, readers should forget about them and consider only the personal "aesthetic bliss" each book offers.
(It's interesting to imagine what Roger Sutton's 18th century antecedent might have written in a similar circumstance. I suspect you could simply substitute "novel" for "YA novel" in the quote, as the prose novel category was considered lightweight popular entertainment, certainly not suitable for the bulk of an educated person's serious reading. History hasn't been friendly to these kinds of generalizations. They simply give too much credence to category and genre labels and ignore individual talent.)