My guess is the guy didn't appreciate, what he thought was, you tail gating him. So he snapped some pictures to take to the police. Which of course won't go anywhere, but maybe in his head, he thought it would. I wouldn't be too worried.
Or he could be from a news outlet and he is doing a expose on road rage. And the picture of you flipping him off would make a good cover page.
Either way I wouldn't be freaked out.
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