Two days ago, I am going up a steep hill in a residential neighborhood at maybe 4 mph in my lowest gear. This neighborhood is where the top 5 percent on the income scale live, large beautiful mansions. A car goes past every couple minutes or so, road is not well traveled. Some of the road is well lit in the sun, some is in shade so I have my blinking rear red light on. Car pulls up behind me, but they only honked the horn for about a second, not the full 10 that you got. Scared the $^*((&*% out of me. I look back and the car pulled into a driveway, so I followed it. Lady gets out of the car and can't figure out why I am angry, she said she was just saying hi to a friend of hers that she saw a couple hundred feet up the road.
If it was a large pickup truck in a poorer part of town, I would not have approached.