There probably was an element of anti-multiculturisation in the leave vote, DM. However, many of those groups you identify inherited rights form the Empire - the British one, not the Hackney nightclub - and the Commonwealth. Furthermore, Boris will compete with the EU to accommodate "refugees" and has already indicated his intention to fast track the immigration/asylum process for potential HSE workers. Hence what that part of the electorate gets will be a long way from what it imagined. Even as far as Eastern Europeans are concerned the deal Johnson inherited from May protects the rights of those already in and seeks to implement reciprocal arrangements going forward. The Jews are probably the big losers... they couldn't vote Labour because they overtly hate them but, as London Mayor, Boris made it quite clear that he has no great love for them either... he travelled by mini-cab instead of supporting the (traditionally) Jewish taxi drivers, promoted volunteer drivers to serve the Olympics and welcomed Uber with open arms.
Surely there is a case for united Ireland referenda given that the republicans now have as many seats in Westminster as the loyalists. I wonder if the Scottish brethren in the UDA will be divided to any extent by the overwhelming remain vote in that part of the United Kingdom of Great Britain and Northern Ireland?