I can only surmise that you did not do a very good job of describing the incident to the cop. That was an example of extremely aggressive road rage culminating in him ramming your moving car. If the cop was too stupid to understand this, you should have demanded that he get his supervisor on the scene, pronto.
I would treat an incident like this as attempted ADW,
(before the crash), and responded accordingly. Someone trying to hit you with a truck when you are in a small car is no joke. You should always call 911 as soon as someone exhibits that behavior. They belong in jail for that.
I have witnessed this "Porsche hatred" on the road, (to a lesser degree), and have zero tolerance for it. You should sue the guy. Make his pathetic life miserable. I would have thrown him a beating, just to defend the image of Porsche drivers if nothing else.
