I was on a recent trip in a car, going to a funeral of all things. Traffic was fairly heavy and some jocker was in the left lane going slower than the speed limit. Several times I had a chance to pass on the right and did but he would speed up to try to prevent it. Because of traffic he would end up back ahead and repeat the process. When I would pass he would glare and give me the finger. On my last pass I just ran away from him and he dropped back to repeat that exercise with others.
There are some scary people out there.
One thing that happens often to me on my bike is that some people just speed up when I try to pass them. Even if there are two lanes going the same way.
A few weeks ago I drove by where the highway patrol had set up a speed trap. I was on my way back to my gas station after work because I had forgotten something. On the way back I go to pass this truck but it sped up. I stayed about even with his rear fender as he accelerated. This of course made him speed up more so I sped up.
The cops had set up their speed trap about a 1/4 mile from this curve. You could not see them until they had you nailed. By then the truck and I are doing about 60 in a 35.
We get to the curve. I grab a handful of brake and he gets nailed going around the turn. Dumbass!