Things that grind my gears, hm..

Major hypocrites (Everyone is hypocritical at times, I usually realize when I am being one and I stop myself.)
People who kill animals recklessly (Usually this is associated with ignorance. I've seen people hit animals intentionally with their cars just because it "it's a snake and it shouldn't be in a parking lot." FYI, the snake doesn't know that, it's likely trying to find it's way back to where it came from. Also it's OBVIOUSLY a garter snake and if you knew anything about the animals you lived around, you'd be able to recognize it instantly. That animal was across the lot and I watched you go out of your way to run it over.
Pardon me if I feel strongly about this subject, I know how silly you must think I am right now.)
Reckless people in general
People who complain endlessly about their normal lives (You know who you are, stop that. Your life is not so bad, try living in a third world country.)
People who make up stuff about their life to gain attention/pity (Your mother is not dead, you were not molested/raped as a child and your dad is not in jail. Making up shit like that is a slap in the face to anyone who actually has these issues.
True story: I personally knew a girl in middle school who's mother died of cancer and who's father died a year after for unknown reasons. I attended both funerals.
This girl is handling her real issues better than you're handling your false ones.
People who think the loss of an innocent life is funny (i.e. children, infants, animals and innocent women and men. I don't even want to dwell on this. It's simply not funny and you're offending me, truly.)

That's all I can think of for now.
Just a note, though: I am not a vegetarian and I have nothing against eating meat or even anything against wearing fur.
I just believe that you should use as much of the animal as you can. Don't let it go to waste, don't kill it for nothing.
I also understand the whole self-defense thing. But don't bother an animal that's WAYYY OVER THERE.