Get the license plate # and call the local police. I did this to a woman that buzzed me, pulled in front, and started pointing to the sidewalk. The police went to here house and set her straight with a ticket for reckless endangerment.
Also know of a local MC cop who witnessed a similar incident and pulled the car over. Another $250 ticket.
In Ft. Lauderdale, a yellow cab cut off one of our groups doing 23 in the bike lane, and the leader crashed into the cab's passenger door. Another ticket, and a banged up bike, helmet, and knee for the rider. And, just as we are all leaving the scene as our buddy was loaded on to the ambulance, another cab makes an illegal U turn, cuts us off. The cop on the scene runs over and tickets that A$$hole too!