Bunnykid68
Grandmaster
Let me add a few clarifying notes. (First and most important note, I am not a lawyer but this is my understanding of the law.)
By and large, Sheepdog is correct. Under a simple/routine traffic stop the passengers in the vehicle do not have to answer questions or identify themselves.
IIRC, under this actual circumstance there was a report of "words and utterances" tossed back and forth between this car and another car. Since this is not a legal transgression in of itself, I would believe that the passengers are still protected by law in not id-ing themselves. There has been no crime or infraction that the police can hang a reason on.
However, if the actions had included something such as an object thrown out of a window towards another car then we might have a different case. I don't know if the officer actually has to witness such a deed or if he can take the word of another driver about it before beginning the legal process of investigating it. Perhaps someone can add to this part. If the officer is indeed formally investigating certain things then he can legally require the passengers ID.
Nothing sounds unreasonable about the scenario you just painted, to me at least