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baldeagle wrote: The OP did not create the problem.

Yes, he did. He escalated the situation when he flipped the guy off.
He was not in immediate danger. The guy was standing outside the vehicle yelling at the OP. It's obvious that the windows are not so darkly tinted that the guy couldn't see the OP flip him off, so it is reasonable to expect that the guy will see him maneuvering to get his gun, and see said gun once it clears the holster.
OP did nothing to deescalate the situation. If he'd just kept the bird in its cage, there would be no need for debate.

You over-reacted. The fact that he saw the gun sitting in your lap means that you pulled a gun on him. Using the 'other finger' escalated the situation.
I think you will be very lucky to avoid charges.