Never Judge a Book by its Cover?

This bothers me and
I’m not sure why.

Is it the irony in judging someone by the book they’re reading, and then claiming
to not pick your books by the point you’re making to the world?

Perhaps its the implication that judging someone by the book they’re reading is
somehow more intelligent than judging them by the shoes they’re wearing?

Or maybe its because I’m reading a lame, trashy, populist book at the moment.

Ah no, I’ve just figured out why it bothers me … its that the very fact that
I’m writing this proves that I’ve managed to completely mislay my sense of
humour somewhere … Wonder where I put it?