1) Fruit. Man, I have always hated fruit. I hate it's texture, I hate it's taste, I hate the sound it makes when people bite into it (or even worse, chewing it, ugh).
2) Football. Because
22 sweaty men piling into each other over a wrinkly brown ball in an attempt to penetrate each other's end zone is manly, and I'm just queer for not wanting to watch it.
3) People not reassessing their life values on at least a weekly basis using the scientific method. It's the reason people are willing to assume that whatever holy text they were raised with is true, and that the monetary system (a system based on scarcity-value which predates the Industrial revolution and has no business existing in a time when technology produces abundance and replaces people at menial jobs) is still alive and kicking.
4) Assumptions in general. You're human. Anyone who speaks English or whatever other human language is human. That means that even though you're intelligent, you're finite. You can't know everything about the universe, so why arrogantly assume that anything is true? (This doesn't cover theoretical or mathematical assumptions, which are tools of academia and science.)
5) Jeans. I hate, HATE how they feel on my skin, and I can't stand seeing them on everyone everywhere! Maybe it's just Indiana, but I even see women wearing jeans all the time. It pisses me off when I see others wear them because it makes me imagine how it feels on my skin. Oh, and I think jeans look fuck, fuck, FUCK FUCK ugly on women. God, the only thing more ugly than a woman wearing jeans is a woman who wears jeans and acts like a man.
6) Cultural monogamy. Once long ago, the greed of the Catholic church prompted the pope to write a new law into existence. You see, if a given family had more heirs, the family fortune would be passed down to the next generation. If a family had less heirs, there was more of a probability of the fortune going to the church. And lo, monogamy was born! One man, one woman! It makes me sick to see people still assume this to be true, as though it were anthropologically correct. Protip: It isn't.
7) Snipers in all FPSs, even if they're multiplayer or designed around balance (TF2). God, why. Why do we continue to need the capability to instantly kill someone from far away without them being able to do anything about it? Hm? Even if you aren't caught by surprise, well, it's time to grab your ankles and kiss your ass goodbye. No matter how good you are, no matter what you did up until that point, even if you're engaged with something else, you deserve to die because some retard wants to push your reset button. What the fuck, game designers? What is wrong with you that you have to assume that because it's an FPS, it requires a Sniper?
8) Society's current structure. So, let me get this straight. In a constantly changing world full of technology, you're going to give the power exclusively to old folks who hate the new world because it meant that they had to learn something new? The people who understand this world, the way it is, the way it works, they get absolutely no power at all? Now, granted, I'm pretty sure the Founding Fathers could have never envisioned a world where everything changes so quickly, and instead recognized the wisdom of elder people. That's fine and dandy, but it's a whole new ballgame, folks, and we need to retire the old runners, especially if they can't adapt or understand anything about a changing world.
9) Eureka Seven. Extra! Extra! Kid whines to green haired brick wall! Imagine your newspaper running that for about 27 weeks straight. There's Eureka Seven in a nutshell.