Thanks for posting this link. As a former bookstore clerk, I laughed out loud (which scared the cat, since she doesn't often hear that sort of thing from me).
My favorite judgmental-bookseller incident, from my brilliant career in the used book biz: a well-dressed lady drove up in a fancy car and came into my humble used book store. She wanted to buy some leather-bound classics with which to decorate her house and impress her guests. After browsing through a number of books and rejecting them because she'd never heard of them, she seized a leather-bound copy of Moby-Dick
. "Ooh," she said, "Moby-Dick. I've heard of him. What kind of a guy was Moby, anyway?"
I sighed and told her that he was "a large white guy."