I can understand your frustration. I have no business being in a left lane, because I drive at exactly the speed limit.
However, sometimes we don't have much choice. Immediately upon getting off a ferry (that I'd never taken before), I found myself in the left lane of a crowded multilane high-speed highway in a major city. People were honking. I would have loved to get into the right lane (and, in fact, off the highway), but there was too much traffic to do so safely.
Then there was the time I took a ramp onto another city highway. Instead of feeding into the right lane, it fed into the left lane. Of course there were cars behind me on the ramp, so I had to go for it. Terrible!
So I could say being forced into a left lane is something that drives me crazy.