I think that the same people who actively campaigned for Leave have promoted the notion that Remainers accuse Leavers of being stupid. This serves to reinforce the defensiveness of Leavers as the disaster that is Brexit becomes more and more apparent.
I think there could well be some truth in that, but I have definitely seen and heard some pretty arrogant comments about the perceived age and education of Leavers. Even though they are borne out by the figures, I wonder how much of that is cause and effect. I don't need convincing that it was a bad move, but when you look at the geographical distribution of votes, if voting had anything to do with intelligence it would seem that populations of some areas are more intelligent than others, and I don't believe that for a minute.
I know that the idea of 'the left behind' is a cliche, but if you are the third generation of unemployed in your family, you aren't going to be swayed by hearing people complain that jobs in finance will go abroad, and if your kids can't afford to move within the UK you aren't going to be bothered that someone else's kids are going to miss out on Erasmus opportunities. In fact you could be forgiven for thinking 'give them a taste of what we've had for years'. There has been too much investment in some areas and not enough in others for decades, if not centuries, and access to mass media means that everyone knows it.
I agree that not all opinions are created equal, and I also get irritated when I hear 'it's just my opinion' said defensively about an indefensible opinion with no facts behind it?.
On the other hand, the defensiveness could well be a reaction to being told 'My opinion is better than yours because I have a degree'. Nobody says that out loud of course, but it was implicit in some of the discourse about Brexit. It's a meaningless boast, of course, unless the degree is both current and in the subject under discussion, which by the law of averages it is rarely going to be.
In itself, a university education doesn't make people polymaths who can understand the minutiae of something like Brexit, with all of its political, economic, sociological, historical, cultural and geographical implications, yet to hear some people talk you would think it did.
The newspaper readership stats are interesting too, but so few people read them now (and those who do are typically older) that they need very close inspection, I think.
Whatever the reasons, I really wish we hadn't let ourselves become such a divided country, with 'boomers' and 'millennials' and 'Gen XYZ', North and South, and so on, on top of the race, sex and religion that has always divided people. I am certain that it's all been done deliberately, but how do we put things into reverse?
There is definitely a PhD waiting to be written about it all, but it's probably too close just now.