This is not acceptable. Any sort of rage regardless of the trigger should not be acceptable. Everyone makes mistakes and a word rather than a punch is much more civil.
Road rage is very dangerous. But as a word of warning, let’s not do anything on the roads or elsewhere to cause a rage in the first place.
Road rage has two parts. 1) the mistaker and 2) the rager. So, in order to stop this hideous outburst let’s not make the mistakes to cause the rager to rage.