Biker Catches Road Rage With Cop On Video

This biker honked at a distracted driver he saw on his phone while driving. Turns out it was a police officer that wasn't a fan of the honking. In the video the cop accuses the biker of road rage and holds up traffic at a round about. Was the officer right to have been upset with the honking or was the biker right to have called the cop out for phone usage?