In case that is sarcastic, let's pretend he was foaming at the mouth cursing at him instead. Does that in anyway justify the perp getting out of his truck and firing shots at him?
nope... but you dont go looking for trouble unless you are willing to find it. The old man decided to ask the guy, one way or another, was he trying to run him off the road.
Serious question for you... What benefit does that action (old man confronting kid about bad driving), in any manner, bring about in this situation?