Which is also why Republicans calling Democrats childish names such as "Dummy-crat" or saying "socialist" (or "commie") for all things to the left of their Overton Window doesn't convince any to their left to change their minds rightward.
I used to live in Cambridge; I knew only one person who was a long-time UKIP voter in EU elections, who was "delighted" by the result of the referendum.
Even though I'd already been openly discussing moving to Germany ahead of the referendum, and went on an InterRail trip immediately before it to find a place to move to in the event of Leave winning, he did not comprehend that my reaction to the result included cutting him out of my life entirely.
He wanted the Cambridge to shrink, I left. That's his face leopard.
(As for intelligence: he also sometimes boasted of being in the international maths olympiad, this was Cambridge after all).
Another argument would be that Vote Leave broke campaign spending rules. In countries with legally binding referenda, that would justify rerunning the referendum. But in the UK it was "only advisory".
Can you point to any examples of this? I don't think the official Remain campaign did anything of the sort. Insulting the people you are trying to convert is a poor strategy, which is why I don't believe they did it.
When you say "were called bigots, uneducated, stupid, racist, etc", what I think happened was that the Leave campaign alleged that that was what the Remainers thinking/saying and it gained traction.