If the aggressor pulled off, I would keep on going.
When the aggressor remains on the road, I pull off.
Remaining on the road with a person who is trying to provoke an accident is a terrible idea.
Pulling over may be viewed as an invitation to confront and certainly gives them the opportunity.
Slowing down and moving over so that they can then forge ahead is a better option. Certainly they can have the road if they want it, but I would not stop on the shoulder of any highway unless forced to by mechanical failure.
These two nimrods stopped on an on ramp.