I've noticed this in myself and others: We can forgive the things we liked as children, and maybe even still enjoy them, because we didn't know any better and there's an innocent joy in returning to that total open-mindedness. But we can't forgive the things we enjoyed as adolescents, because we were beginning to try to be adults, often self-importantly, and it can be excruciatingly embarrassing to be reminded of what we thought was deep and mature then.