This doesn't fly. Call it what you will, but there are two groups of drivers - those who speed and those who don't. Roads of a suitable volume/use are typically multiple lanes and are designed (in part) to allow for staggered speeds. The left lane is typically the passing lane or the fast lane.
If a driver wants to be on the slower side of the traffic flow, he/she needs to stay in the right hand lane. It is not his/her job to enforce the speed limits. And at a minimum, they can not be a nusance simply by travelling in the right hand lane and not creating a jam up in the left with traffic who want to travel faster then them. By ignoring this, they are simply being inconsiderate and I have no patience for it.
This (as you can probably tell) is a pet peeve of mine as I am usually "victimized" by this type of behavior on my way home in the evenings travelling down Rt. 301.
in most civilized states this is the law, however you will soon be told 2 things by the road nazis
1. there is no stay right except to pass law in Maryland
2. the speed limit is the same in the left lane as it is the right.
Not that I am not sympathetic to your point or the OP. More to the OP's point, there are people, regardless of the lane they are in, who just don't like being passed.
I've had the cruise control set, found myself closing on a car in the right lane, put the blinker on and moved left. Then for some reason I find I am no longer closing, but merely pacing as the driver in the right lane has decided to accelerate. Since I don't want to tailgate NOR do I want to be part of a rolling block, I accelerate to complete the pass only to have the driver again match my speed.