There’s nothing an “ass move” about camping out in the right lane. If you’re going slower than the rest of traffic, you damned well better be in the rightmost lane! Camping out in the leftmost lane and not allowing cars to pass you is a bit of a dick move. Central lanes kind of anything goes, but should be moving faster than the rightmost lane.
What annoys the crap out of me is people passing me on my right. This may be because in other parts of the world where I’ve driven, it is considered almost unthinkable to do such a thing (or passing on the left in left-hand traffic countries). When I’m driving in the left lane, I’m passing the cars on the right or central lane. Suddenly, I see some guy shooting up my ass about 20 mph faster than me so, of course, my intention is to signal, get into the lane to the right of me, and let him on his merry way. As I’m about to do that, speeding guy himself gears up to turning into the space I intend to turn into and this briefly creates an ambiguous situation of who is going to yield to whom. This annoys the crap out of me.
In Germany, Austria, and Hungary, the “up the ass” car would remain in the leftmost lane, usually flashing their high beams signalling their request for you to move out of the way. (In the US, this type of high beam signalling is considered extremely aggressive, though. I didn’t get the sense it carried more than an “excuse me, I would like to get by” connotation on the Continent.) I rarely, if ever, remember the impatient car deciding “ah, fuck it, I’ll pass on the right.”
Now, I guess that lane culture doesn’t really exist here in the US, so I can’t get too aggravated about it, but it still does peeve me.
As for traffic courtesies, I sometimes feel I’m the only person left in the city who actually waves “thank you” every time someone lets me into their lane. As a matter of course, I’m very courteous and generous about allowing cars into my lane, but it strikes me that maybe 1 in 30 cars will give me the courteous wave. It’s not something I get irritated about, it’s just something I noticed. I seem to remember it being far more common when I was learning to drive about 25 years ago.