Why is 'not taking it seriously' bullsh1t? The 18-30 year old bracket was seriously under-represented on a proportional basis, you don't think that it is possible that they took for granted that we wouldn't Leave? I do, although I would agree they deserve everything they get if that was the reason.
You portray the approach as being similar to a teacher and a naughty child but that's just a frivolous analogy meant to demean the approach. The reality is that some of the issues with a single referendum could be addressed with a second referendum without leading to a possible third referendum. That's my utterly irrelevant point.