Here's an interesting qustion:
How did the boy feel about being asked?
Seeing that it was his purchase that was being questioned and not the father's, wouldn't it be more prudent to get a real/true representation from the one who was at the center of this?
We can all speculate and respond based on our own past experiences, but kids will always respond differently to variable scenarios. If the kid didn't feel slighted, or insulted maybe we should just let this
be!