The wrong Xbox
As far as I’m concerned this is a bit of a weird one. The narrator offered up his more knowledgeable opinion to the older couple to stop their grandson from being disappointed. He was just trying to help them out.
They might have been embarrassed that they had picked up the wrong one, or they might have been hoping to buy a cheaper model and save some money. I guess it’s not really any of his business, but they didn’t need to argue with him so vociferously.