Just another variation of road rage. We can cause a driver several seconds of delay and they go ballistic.
I rode down a slightly twisty road recently, with six vehicles ahead of me and maybe two behind.
One of the motorists behind laid-on his horn, despite zero chance to reach his destination any quicker.
When the road widened, he passed rather closely and blared his horn again.
I laughed when he got hung up at the left turn light and I breezed up to the front of the same left turn line.
He sounded his horn again and made a special effort to drive in my bike lane, a half mile further.
Hopefully, he accepted defeat when I passed him again a mile away at a stop light. Four miles and a tie score!