Well, I only have one answer for this one. I can think of plenty of movies I dislike, but genuinely, honestly, truly hate? That's reserved for something really special. It takes a lot of energy to hate. And I can only think of one movie I happily will spend that much energy on, hating it.
The Matrix (1999). You know, I don't even think hatred is a strong enough word for what I feel for this film. And a large portion of that hatred is wrapped up in the fact that many subsequent movie fights were ruined by this film. They became exaggerated caricatures of fights. Heavily choreographed, slow motioned, impossible, stupid. Not all films, obviously, but enough to raise my hatred towards The Matrix with every one I saw. Besides that, I just plain can't stand anything about that movie, from plot to characters to everything in between and beyond. It's the only movie I can say that about.