Jim, here is a survey that challenges your view of Brexit supporters.

"There is little connection between racism and calls for greater immigration control, according to a think tank. Despite claims that last year’s EU referendum was driven by xenophobic attitudes towards immigration, British people are actually ‘nuanced and sophisticated’ on the subject, Open Europe’s study found.
Aarti Shankar, a policy analyst for Open Europe, said: ‘We found that Brexit is too often wrongly seen as a mandate to pull up the drawbridge. ‘In fact most people have a relatively nuanced view and can articulate both the advantages and disadvantages immigration brings. ‘We found little evidence that the desire to control migration was driven by racism or xenophobia.’ "
http://metro.co.uk/2017/12/21/people-didnt-vote-brexit-racist-study-finds-7176198/