And this is what we like to call road rage.
Yes it bugs me if somebody sits in the right lane when shouldn't, but sometimes is needed due to about to take a turn off, or actually over taking.
If I'm driving right on the speed limit or a little over and I'm passing cars in the left lane, then you get somebody who wants to go 20+km's over the limit and over take, and sits on yours arse while you are trying to overtake at or barely over the speed limit. That is not good, not safe driving. They are being a total tool bag.
If somebody wants to tailgate me on a single lane road, and I'm already doing a little over the speed limit, I'll flash them my brake lights a couple times to remind them to get off my arse. If they don't, I will slow down to the speed limit, not stupidly below, but I'm not gonna put up with somebody sitting on my arse when I'm already doing the speed limit or slightly over already.
I'm not as bad as my father though, on the clide this car was talegating him for ages while he was driving with a trailor. Dad would literally slam on the breaks if anybody ever tailgated him. I'm not about to risk causing an accident, but that is why I will slow down to the speed limit. If the road conditions are not good, I will slow down below the limit so whatever gap the car is leaving, is a safe gap for the speed we are to travel. I don't do it to piss them off, I do it cos I don't want my car rear ended cos some turd is too impatient to sit back an extra meter when I'm driving at or just over the speed limit already.