Jerk parents are jerks.
While I don't like the way the parents act in this book, I do like the child's solution to it. I guess some parents are like that. I'm not. It's definitely not a good book, but she's got a very creative solution to it that her parents are just bemused by. "Oh well, those kids and their blankets. What are you gonna do?"
Message
You have to get rid of your favorite toy when you get older.