Yeah, this is just completely normal. Nothing strange to see here.
You may have witnessed something like this parking lot dispute at some point in your life. Hopefully no one was hurt and the fight was broken up before it could get out of hand. Unfortunately, that's not always possible, and what may have started as nothing more than minor argument erupted into borderline complete chaos. Or just a man hanging on to a moving car after it tried to back into him. That's pretty much what happened here and everyone present, including the person filming the whole thing, was shocked by the outcome.
From what we can tell, nobody was killed or seriously hurt. But still, nothing like a Pontiac Grand Prix driving down the street with a guy hanging on to the back for dear life. Yeah, that's normal.