Someone threatened to call the cops on how I was driving, what's the most that could happen?

In was in a school zone and I was going really slow, I stopped at the stop sign and was turning right, when this other truck came out of nowhere coming straight from my left side, going much too fast in a school zone. He looked big and scary and told me to pull over and started saying how I needed to aplogize, but I was petrified since he was obviously very angry. I'm pretty sure he got my plate number down, what's the most that could happen?