I hate gaffers, key grips and best boys. Especially best boys.
This sums it up fairly well for me. I did watch the Shawshank Redemption and didn’t actively loathe it, but I actively avoid these genres.
Musicals.
Slasher flicks.
Talking animals.
Anime.
Anything with Richard Gere or Hugh Grant.
Generally, romantic comedies, especially those where the plot hinges on one of the main characters being currently dating/engaged/married to a total jerk, so you’re not supposed to care if they cheat on them. Especially if there’s no real reason they’re still with the jerk in the first place.
ME, TOO! I can’t watch mafiosos, no matter how cute, colorful, or what great cooks they are. I read someplace these ignorant goombahs take their behavioral cues FROM mafia movies and start acting, dressing, and talking like the goons in the Godfather. They are indeed repellant scum and movies playing up all their little ways are gross.
Not EVERY single one, but I also don’t care for:
Sports.
Westerns.
Romantic comedies (fairy tales full of shit for the ever-hopeful, who hope to meet cute and get a big buncha flowers and a teddy bear for Valentines Day forever after.)
Do Lifetime Movies for Distressed Women count?
Yeah; don’t get me started on them. 
Oh and buddy movies, especially if one of the buddies is an animal, and even more so if the animal can talk (even if only to the audience).
Horror movies is a definite no-go for me. I freaking hate getting scared and I don’t know how anyone can view it as entertainment.
Any kind of romance. Romantic comedies are bad enough – they’re as formulaic as Scooby Doo, they have no relationship to how anybody acts in real life and the “comedy” is usually witless and inane. Even worse than rom-coms, though is ponderous, melodramatic, overwrought bilge like The Notebook, or The Time Traveller’s Wife.
Simplistic, B-level actioners of the Steven Segall, JCVD variety – i.e. kickboxer or obese martial artist goes around beating up cardboard bad guys in an endless serious of badly choreographed set pieces until he kills the head terrorist/drug dealer/white supremacist and rescues the girl. They’re like watching extended WWE angles, with about the same level of production values.
I’m not a fan of children’s movies in general, but I have to watch a lot of them with my kids. Pixar is occasionally tolerable, but even then I’d still rather watch a documentary on salt or the latest slasher remake.
I’ve never been able to get into old “classic” movies from the 40’s and 50’s, or really much of anything before the late 60’s. For one thing, I loathe the Hayes Code straightjacket those films were made under. I want profanity and graphic violence and nudity. I don’t like watching a movi knowing it can’t really take any chances, or be really dark or even realistic, and that there’s no chance an actress is going to take her top off. Aside from that, I also find the acting really cornball and unrealistic. It’s like they all had this rapid fire deliver that sounded ridiculous, and the actresses, for some reason, all talked with this weird, affected, semi-British accent that no one has ever talked with in real life.
I also hate musicals. Nobody picks up out of the blue and starts dancing and singing in real life. Musicals are ludicrous.
I hear you on that, although I’m afraid to say it out loud in case the gay-stocracy get wind of it and revoke my gay lisence.
Absolutely this. I can’t stand romance movies of any type.
Torture porn/violent horror movies - unless they have a sense of humor, like in Sam Raimi movies or “Re-Animator”.
Fratboy movies, other than “Animal House”.
On a related note, Will Ferrell movies. The man is a vortex of unfunny.
Chick flicks. I’m not gonna see “How Stella Got Her Notebook From The Time Traveler”.
ETA: I hadn’t read Diogenes’ comments, and yet I picked on 2 of the same chick flicks.
I’ll third (fourth? fifth?) torture porn and go on to say that in my so-humble opinion, there is something kind of wrong with people who really get into them.
I hate chick flicks in general with the exception of Under the Tuscan Sun. Frances’s experiences in that film very loosely mirror my own wayyy back in the day, and I can identify with what she feels and says. It’s the only chick flick I own on DVD.
I don’t like Georgian or Victorian costume things either. With my low-level hatred of chick flicks and costume things, it kind of sucks that I’m married to a Jane Austen/PBS fan, but there you have it.
I don’t watch Westerns.
I despise mob/mafia/gangster movies. I have seen 30 minutes of The Godfather and got so bored, I changed the channel. Just now saw Scarface, which is really more like a drug dealer movie. (Not bad.)
Oh yeah, and I hate anime and musicals. I love, however, bio pics about musicians and movies with really great soundtracks. I find, when there’s a serious topic being discussed and suddenly the characters break out into song, it’s jolting and takes me right out of the movie.
I’m not a big fan of Kung Fu/Martial arts movies, but I will tolerate them if they’re well written, well done, or look good (art direction). Crouching Tiger, Hidden Dragon? Loved it.
I’m not a big fan of lots of shooting up of people in movies. But I don’t want to say I don’t like violence and gore because Tarantino’s movies are some of my favorites and they happen to be very violent. Let’s just say I take my violent-action-shoot-em-up movies in small doses.
Oh, and there really is only one sports movie plot. It’s Rocky and all the other movies involving sports generally involve the exact same plot: Loser/underdog wins in the end. There really is no reason to watch another sports movie once you’ve seen one.
Rocky lost in the end (at least in the first movie).
Torture Porn
Romantic dramas
Romantic comedies unless there are b00bies
Musicals
Anything with Martin Lawrence
Westerns
Sports
Westerns, with the exception of The Quick and the Dead, which I discovered while stuck on the treadmill at the gym. I also put 3:10 to Yuma on Netflix.
And on that note, John Wayne films, with the exception of The Quiet Man, which I’ll watch a million times.
Movies about plane disasters. I’m a nervous flier as it is. Exception: Airplane! (They bought their tickets. They knew what they were getting into…)
Anything film about 9/11: No exceptions. Too soon for me. I’m not ready to see it propagandized in a blockbuster film.
Ha! Thank you - made my day.
MiM
Anything with Rap music or street dancing. Ugh!!! I don’t enjoy watching people spinning on their head.
There’s nothing wrong with disliking musicals if it isn’t your taste, but I hear this reasoning often and it doesn’t make sense to me. Many types of movies are not realistic. Nobody picks up a phaser out of the blue and starts blasting people either. Does that mean that science fiction films are ludicrous?