Not a good way to get leverage in an argument, especially at night on the side of the highway.
The story itself is kinda ho-hum, but commenter wideopenspaces brings up a good point: why would anyone pull over at 12:30 at night in a one-way-street (I know where this happened) to bicker with someone that they don't even know? That's pretty reckless in its own right. This all happened in Stafford county (borders Spotsyltuckey) which is not known for competent drivers nor sane people.
The only thing I can guess is that the complainant thought he might get to beat down the other driver in obviously justifiable retribution for such a hurtful "hand gesture", and then realized that the other guy wasn't wrapped real tight either.
Man, I wish all the savages hadn't decided to move here. Things used to be so quiet.