Is it normal to hate obvious plots and endings in movies?

I remember this one dude made a big deal out of the movie, The Usual Suspects, and I figured it out in like five minutes, then the stupid guy got upset, and didn't want to watch the movie. I honestly didn't care. I'm one of those people who doesn't care about spoilers. If I'm watching a movie, or reading a book, and someone tells me how it ends I honestly don't give a shit. I never understand people who get so upset if you tell them how a book, or movie ends that they just can't finish it... meh.