Actually, emphatically correct.
First, there is NO law against politely and calming talking to a stranger.
Second, it is not a “fight” to politely and calming talk to a stranger.
Third, IF you are going to argue that the parking space dispute was a “fight”, the WOMAN started the fight by illegally parking. The man RESPONDED to that action by politely telling her she was illegally parked.
THis should not be a dispute. If you are walking down the street, and someone throws a candy wrapper on the ground, and you say “hey, you should throw that in a trash can”, that does not justify another person coming up and assaulting you physically. But you seem to argue that it does, and that any person who tells another person they have done something wrong is “starting a fight” and should expect to be physically attacked.
Rationalize all you want, but when the shooter started harranging the woman, the fight officially started. If the husband did not get out of the car to defend her, he would not have been much of a man.