This could be me writing that post. I experience the same thing when I ride. Random hollers...nothing about me ,just yells. The right lane thing also,,,I wave them to turn ,but they just wait. Usually older people. Sometimes I get the ones that just stay behind me because they don't think they can pass me (on roads with no bike lanes). That's the worse.
The honks I think are just because some people just hate cyclist. The friendly tap honk I get also. I just ignore them.
When I used to run I would get the same thing. Maybe people have nothing better to do in their cars.