To answer your question, I'd report it just in case the other driver now knows your plate and crazily pursues you to do harm, so there's some report/evidence floating out there.
On a more general note, the closest I've coming to road rage is situations where drivers are too clueless or just refuse to get the hell out of the left lane over miles on otherwise open highways, predictably causing a traffic jam of slower-moving vehicles by their actions. After waiting a cursory 15-30 seconds, flashing brights, beeping, and then briefly tailgating to let them know to move out of the way, the remaining options (besides maintaining an artificially lower speed; not interested in doing so) are not good and get increasingly dangerous for everyone involved. Luckily I have zero interest in angrily confronting/threatening other drivers and rather just aim to pass, so offenders get cut off at sometimes quite extra-legal speeds. Not that I'm making any attempt to justify my actions, but some of these situations could have been quite easily avoided, or even not escalated with a simple lane change.