Yeah I've had that a couple times. Once was a honk (I can only assume was) because I wasn't tailgating--yet we were moving at the same speed, so the driver swerved from behind me to the side and then in front--then slammed on their brakes.
The other time was after cruising during a lot of short stop and go intervals (so it was easy to judge crawling speed, that is to say). I eventually switched to the lane I needed and the guy who was rubberbanding behind me the entire way (pretty much going 1-10-1mph constantly instead of just sitting at 3 like me) pulled next to me and shook his head. I had a good feeling why, so I rolled down my window as we came to a stop next to each other at a light and asked if there was a problem. He said, "You drive like a dumb ass". "Oh, I do? Please tell me what I was doing wrong so I can improve". "You just drive like a dumbass". "No really, you seem like you know a lot about driving, please enlighten me". And he rolled up his window, the light turned green but he accelerated before the car in front of him had a chance to go (perhaps to get away from me, I'm 6'2" and 250lbs.), and then slammed on his brakes again...
Dunning-Kruger, if you ask me.
