The point is that in this case, there could certainly be another side to the story.
Well, of course. But since all we have is this media snippet then that is what we use to judge the situation. We're not the jury, and our judgement has no consequences (other than potentially looking like an ass

), so it is okay for us to use it for what it is (entertainment) and discuss it here.
I do appreciate your ability to read between the lines on behavior, though. The fact that the mother kept the ad running even though the car had sold hadn't really registered for me. I also hadn't thought "Would I do this to my teenage son?" And My answer was no.