Who exactly is in the wrong here? A sociological study -?

A man is pulling his car around to pick up his disabled fiance at the entrance of a store. A young woman from across the crossing (by where the cars park, not near the entrance) pushes her cart forcefully to where the carts are corralled inside the actual building. This causes the man to have to stop his car or it will be hit by said cart. He curses at her, and drives on up to the entrance to get his fiance. The young woman proceeds to walk up and go off about being cursed at and refuses to apologize for her previous inconsiderate action of almost hitting his car, her excuse being that she didn't hit it, so what does it matter, and she was cold so she shouldn't be expected to walk it to a corral by her car or walk it to the corral in the building. When she doesn't back down and keeps running her mouth, she is told by the man to walk away and when she doesn't the disabled fiance proceeds to threaten her as well. It almost becomes an altercation, but the man keeps his fiance off the young woman and some stranger intervenes with the young woman, telling her just to apologize (which is what the inflamed couple wanted in the first place). As the couple pulled away, the girl is heard still insisting there is no reason to apologize.

No one hurt anyone and nothing else happened, but I'm interested in knowing some opinions. I'm of the opinion that people like this young woman are being raised not to know right from wrong and have no manners at all. Why else would she not understand that all she had to do was apologize? The girl was clearly in the presence of elders as well, where were her manners? I think the couple definitely over-reacted, but were they wrong to be upset and demand an apology from the girl?

I'm just asking this from a sociological perspective, so please, be honest. I want to see, especially, what the age factor does with responses. If you would, please be clear on your age when you reply. In the interest of research, thanks in advance for complete honesty and straight-forwardness.