I think that's a sweeping generalisation. I suspect, admittedly without numbers to back it up, that a significant minority of people in the UK - myself included - are happy to be part of a greater European state. I also suspect that there is a generational factor, and that this significant minority will grow over time to become a majority.
The problem with you rejecting my claim as a "sweeping generalization" is that you've done exactly the same in your counter argument.
Polls are not reliable (they didn't predict the vote, after all). The vote is the most reliable data we have on the positions of the people of the UK. It is the biggest sample set of any measurement performed, and 1.3M more people turned out to vote leave than to remain.
My assessment of today's youth is that they're rebellious, like any generation of youth. What they're rebelling against is pro-EU, pro-socialism that has been fed to them throughout their childhood. Conservatism is on the rise among the young.
Your claim that the vote is the most reliable data we have flatly contradicts your last paragraph: 61% of men and 80% of women aged 18-24 voted Remain. The Leave vote was very much carried through by the older generation. The polarity is such that if you
assume the same proportion of remain voters for those below 18 (and I don't see why not) then the tables turned last November.
The thing is, the people of the UK don't want to be part of that "United States of Europe". It is being forced upon them. The failure of pro-EU people to recognize that they are breeding unrest will lead to civil war, unless they allow the Brits to exit as they've voted to do.