I’ll start…
Left lane campers
Both sides of the argument are passive aggressive assholes. Left lane campers are either doing it intentionally to be an asshole, or they are just low IQ morons and completely oblivious. Regardless, camping in the left lane is illegal. It also causes congestion, bottlenecks traffic and increases the risk of accidents when the person doing so is going slower than the flow of traffic.
However, the folks that rage about it are no better. Technically they are correct. The left lane is for passing and camping is illegal. But they just want the left lane clear so they can barrel down the highway 30 mph over the speed limit. Just because you are doing 95 in a 60 does not mean the car doing 80 and actively passing heavy traffic must slow down to 60 and fall in line behind slow traffic for your convenience. And barreling down the highway and riding their bumper and flickering your bright lights makes you just as much of a douche as the slow campers.