Fair enough, actual screaming is not in evidence. The witness who reported to the clerk that there was a guy harassing a woman in the lot is seem on video. He looks to be about 20 or so feet away, but seems alarmed. This seems to suggest that it was more than a conversation. Would you agree that it was likely pretty loud and heated to draw this attention and reporting?
I'm not suggesting McGlocklin made a smart move, and your response is of course the preferable and more civilized. But if you were to pick a fight with a woman in a car (with her infants inside) out of the blue, and the father comes up and pushes you away, can you see how that is not exactly an attack? Far closer to over-protectiveness in my book, while again not excusing it.
That's fair, kids bounce back. But same scenario: you walk up and pick a fight with a woman and her infants with a gun in your waistband (Drejka is reported to have picked the same fight with others at this same location, and the Sheriff says he was reported to have brandished his gun in an earlier road rage incident). This guy was ready and prepared for serious confrontation. That he went ahead and initiated.
Illegal parking is a great way to pick a fight. People that do so tend to be arrogant and entitled, making them great candidates to get rowdy with. Or you just get high and mighty and give them a lecture or browbeating. I doubt it had any real significance other than a convenient justification.