We reported an incident similar to this a couple of weeks ago. Police did nothing and what happened with us was way worse.

My girlfriend and I were out riding. People came by throwing stuff at us. They went up and turned around and threw more stuff at us. Turned around again and came by us throwing even more stuff. I saw them start to turn around to come back at us again and told her to get off her bike. I got off mine, took my shoes off because I was going to throw down if they stopped. She was standing about a foot and a half in the road in the opposite lane. They swerved the car across the center line and hit her and kept on going. I had the make and model of the car, probably was within a few years of the year of the car too and all but the last two digits of the plate. Reported it to the NC State Highway Patrol, they did nothing. The officer on duty that took the call's reponse? "Why would anyone do that unprovoked? You must have been doing something to instigate it."

Guess the guy has never been out on a bike before.