oh man I could create a list of this stuff:
-people who get on the highway and head straight to the far left lane regardless of traffic
-people who stay in the far left lane and drive slower then the speed of traffic
-people who ride on your ass instead of passing you
-people who speed up and slow down all the time such that when I have my cruse control set they'll blast by me then 5 minutes later I'll pass them, then they'll blast by me again, and I've never changed speed.
-people who block traffic by not going any faster then the cars in the adjacent lanes
-people who are too afraid to pass someone going slow on single lane highways and then end up stacking the cars up in a long line making it increasingly harder for people who actually have balls to pass (can't tell you how many time I've had to pass 15+ cars in one go)
-people who are too afraid to merge on the highway so they come to a complete stop at the end of the ramp... making it harder for them to actually merge with the 70MPH+ traffic
-people who forget that they can make a right on a red light
-people who have the right of way and just sit there while everyone else waits for them to go +bonus points if they don't even have a stop sign or traffic light ++double bonus points if they start to go after someone else gets tied of waiting and just goes and then the dumb-ass gets mad about it
-people who cut you off and just wave like it's OK, like you gave them permission
-people who are taking a left hand turn at a light and blast out when the light turns green instead of waiting for the straight traffic to go first.
-people who stop to let you pull out into the road when they're the last car in a long line of traffic, while the gesture is nice it proves they have no idea what's going on around them and it costs both you and them time because you could have pulled out sooner if they just drove like they were supposed to.
-people who cut out in front of you after cutting across parking lanes, as if they had the right of way
-people who can't park their car evenly even in the simplest of parking spots +bonus points if it's a tiny economy car and they're still over the line (I drive a large truck and If I can get it perfectly parallel and evenly spaced within the lines... so can anyone else).
-people who have no appreciation for others cars and let their door fly right open into your doors or fenders

+bonus points if they did this because they didn't park properly ++double bonus points if you were in your car and they showed no remorse while doing it.
-people who drive with just their parking lights on when it's dusk or during low visibility weather, as if it's too difficult or too wasteful to just put your headlights on like you're supposed to
-people who don't put put any lights on at all during low visibility weather
-drivers who look at their passengers when they talk to them +bonus points if you're the passenger and fearing for your life because the driver isn't watching the road
-people who can't manage their speed and are constantly switching between accell and brake overshooting their desired speed instead of just applying light pressure to the accell
-people who slam on their brakes at the last minute when coming to a stop instead of starting their decell at an appropriate distance
-people who squish themselves up to the car in front of them at a red light or other traffic stop +bonus points if it's a hill, they're behind you, and you're in a stick ++ double bonus points if you scare them by blatantly rolling back.
... I'm sure I could think of more
if you didn't gather... I really hate people.