I have a laundry list...
People who ride their bikes on Rock Creek Parkway on the road instead of the bike path. Yeah, I know, joggers, dogs, all that stuff in the way, blah blah. It's a pretty nice path, well paved, and you don't run the risk of someone coming around one of those blind curves and running your arse over.
People who ride their bicycles two or three deep on any street so it becomes impossible to pass them.
Ditto the people who carry every single thing they have ever owned onto the plane and try and stow it in the overheads, especially when they invade the bins across the aisle from their seats because their bins are full.
People who bitch and moan and put up a fuss because their plane is delayed because of weather. You don't get anything free because a giant thunderstorm happened to roll in. Get over it. The gate attendants want you out of this airport even worse than you do. Shut up, sit down, and play nice.
The armrest invaders on planes or trains.
People who chew really loudly. If it's something crunchy, I can understand but I shouldn't be able to hear you attacking your General Tso's from across the room. It's just disgusting.
Comcast's crappy customer service.
People who don't clean up after their dogs.
People on the bus who sit on the aisle seat and don't scoot over or let you slide across them even though it's clearly the last empty seat on the bus, or people who put giant shopping bags or backpacks or whatever on the seat next to them even though there's no empty seats.
I could go on forever... really... personally I think you should have to pass an exam before you're allowed out of the house!