Why do young people hate this?

I just don't understand. I'm young, too, I'm 14. But I love this movie, I don't lose a word and I can understand it all; but my schoolmates, they keep saying it's a boring crap. But why? They cannot follow the plot, they don't understand a word of it. I'm starting to get angry! Is this because they want to feel big, or something like this? I hope that older guys find this great, because I feel so uncomfortable with people who don't like this movie just because the dialogues are a bit complicate.