the replies in here
they asked to list Italian books written from 2000 onwards, yet the teachers of those classes decided to go ahead and include that book.
Also, that is not a book for high school kids! It's trash, it should only be read by adults, this is disgusting.
Italian high school teachers are very politicised from what I remember, I had one who was openly fascist and defending Mussolini, so I'm not surprised.