I used to have a modified Astra coupe. In honesty, I think people expected me to drive like a dick, so I frequently did.
About six months ago I got rid of it and replaced it with an eight year old MPV. It took me a good few months to adjust to people just pulling out in front of me when I was doing 70ish, just because they didn't want to be 'stuck behind' the mammy-mobile. Now, for my own safety, I just pootle along and expect the very worst from people.
I have to say, the following kinds of car have consistently been proven to me to be driven by wankers:
Audis. You are not in a fucking Ferrari, you're in a 1.9tdi, frankly, my mammy-mobile is faster than you, so fuck off away from my back bumper and wait in the long queue of traffic patiently like everyone else is. No, flashing your lights wil make no difference. I'm not moving over to allow you to literally get 30 feet ahead of where you were.
BMWs. You are a moron Mr BMW sales rep, with your snazzy bluetooth earpiece. You did not need to cut me up on the roundabout, just to pull into the next layby. Knob.
White vans. I can't decide if you're trying to intimidate me, or if you're attempting to climb into my back seat. Either way, please stop it. I'm doing the speed limit.
Anything being driven by someone where all I can see of the driver is the very top of their flat cap/blue rinse peeping above the steering wheel. You are too old to drive. I understand that when people get older their perception slows down and now the road seems a big, fast and scary place. However, you're doing 25mph in a 60 zone. You are going to cause an accident. Also, do you really need to be out and about in commuter traffic?