Just because your in the right, doesn't make you right.
Many states do not allow you to ride side by side on a road like that. Cyclists are restricted to only 3 feet left of the white line.
IMO. They should have rode single file to allow cars to pass, then when clear ride tandem again. The driver should have also provided more room. It looks like he was pissed and trying to show the rider that he was, just got a bit too close