"OMG COOL LIFEHAX"
"It's a tip."
Smokers in public.
Egotistical people, and by extension, those that take a lot of selfies.
People who are over-concerned about their image. Chill, and be real.
People who cause movement through a walkway to be blocked by taking pictures. It's like a mix of emotions. Yes, it's rude to get in the way of a picture, but it's also rude to be blocking the way in the first place. Forcing a moral dilemma.
People who self-victimize. Seriously, just take responsibility.
Parents who defend their kids to the end of the Earth; right, wrong or otherwise. Kids will grow up with a sense of entitlement, and it annoys me when the same people say "Kids these days." Just grinds my gears.