People and their opinions

Why do people feel that their opinions are more important than someone else's?

I dislike Leonardo DiCaprio... both as a person and an actor. Sissy and Pingu have just gone to see the film Inception and were waxing lyrical about how brilliant is was. I said that I still didn't what to see it as Leo is the star of the film. I was basically told that my refusing to watch an actor I dislike is stupid and that I'm missing out on so many good films.

I DON'T CARE!! I dislike him, I don't like his acting, I refuse to give someone I don't like any of my hard-earned cash (through royalties and such) so just SHUT UP!

I don't care how good the film is, if it stars someone I don't like then I won't watch it... on the flipside if there is a film that stars someone I love, then even if the film is dreadful, I will watch it. I can't help not wishing to spend hours of my time looking at people I can't stand!! It's just the way I am.

To be told, on a fairly constant basis, that my opinions are silly and I should change them really pisses me off!