"Its perhaps understandable why xenophobic rhetoric appealed to some Brexit supporters. Resolution’s Bell found that even though pro-Brexit voters weren't from places that had ​recently gotten poorer since the mass immigration wave, they were from places that had ​historically been poor — going back to the 1980s. These people have good reasons to be angry about the status quo. They’re looking for someone to blame, and immigrants are an easy scapegoat."

"Irrational Xenophobia, not Real Economic Grievances"

Here is what is missing in the analysis above:

Support for UKIP "is even higher among the self-employed and business owners than the working class, and that is quite high even in the professional and managerial classes, who because are their substantial numbers actually provide the biggest bloc of UKIP’s class-based support. For all of these reasons the Conservatives, not Labour, have most to fear from UKIP ...

Working class voters are a little more likely to support UKIP than other classes, but there is stronger support among the self-employed and business owners, who were Mrs Thatcher’s hard-core supporters, not Labour’s. Even within the working class, the strongest UKIPers are the lower supervisory category, who are not the disadvantaged semi- and unskilled workers that have been thought to provide the core of UKIP support." 

Now, have a look at the 20th century fascist movements in Europe.