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NJ...if you read all the details in the link, it makes it quite clear that not every white, uneducated, working class person voted to leave, or that every highly educated middle class person voted to remain. But the tendency was there.
It also makes it clear that lots of educated, middle-class people must have voted to leave, otherwise the leave campaign would not have won.
You have mentioned quite a few times, that you know very few, if any remainers, which of course may very well be true within you immediate social group.
But I, in contrast, meet many Leavers, perhaps because I move in mainly working class circles, and the majority of those people, when asked, give their reasons for voting to leave, because of all the "foreigners in Britain"