Here's a better analysis of the Brexit thing which was posted here yesterday. It was mostly decided by the fact that the pro-Brexit people had better marketing campaign.
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.