This is me too! I don’t like Avatar, think I wat he’d maybe 5 min of it so it doesn’t interest me. My 17 yo also said the same thing “why would I want to wait in a line for a ride about a movie I don’t like.”
To be fair, it's not really a ride about a movie. The theming is of the movie. But it's more about the experience of feeling like you're flying. That's like saying you won't try Soarin' because you don't like the ocean, or you won't walk through Cinderella's castle because you didn't like the movie.
You're right- you don't have to like everything there. There are some things that I don't like. But at least I've tried them before I form that opinion.
