Known only as William, the kid says: "Nani? There was a spare seat next to me and my dad up there—he should have been sat there."
The clip went viral after United's opening-day loss to Swansea, but it actually dates back to the end of the last campaign—fitting, in a way, that the same old issues remain.
William's opinions were again sought after the Swansea game, with Full Time Devils also providing a longer video.
Spoiler: He's no happier with the team.