There's a road with 3 lanes in each direction and no shoulder for a few miles. The speed limit is 40 and there are plenty of lights. I take the right lane on my bike and go 15 mph. Most people just choose one of the other two lanes to pass me well in advance. But there are almost always a few idiots who honk. One time there was someone who leaned on his horn and followed me even though the middle lane was clear. I just laughed when he cursed at me.
So I tried an experiment. I drove my car at a maximum of 15 mph in the right lane. No one honked, and everyone changed lanes. That was the case for three different trials in my car.
Why do people get angry about a bike going "slow" in the right lane, but not a car going slow (or sometimes even a bus stopped in the right lane to pick up passengers). At least on a bike I can keep a higher average speed than a bus in the right lane or my slow moving car, since I can filter forward at red lights but a car or bus can't do that.