Well... enough bad memory of some teacher wanting us all to read and ponder this thing in class, seemingly with the confused notion that this would be some kind of lesson in psychology.
I think the author would be very surprised if he'd been there to see what amount of fluff has been generated around his nice and simple quasi-autobiographical codebook.
This problem plagues so many well-known works of literature. Modern American classics like The Catcher in the Rye and To Kill a Mockingbird have also been forever tainted with unpleasant memories of high school classes.