Earlier quoted context omitted.
I hear this theory a lot, but the fact is most of the support for Brexit came from low income households, and people in low skilled or manual work. Generally the higher the household income, the lower the support for Brexit, even at the higher income levels. https://www.jrf.org.uk/report/brexit-vote-explained-poverty-...
That's why the super-wealthy fund propaganda campaigns aimed at those folks.
When he was a journalist in Brussels, Boris Johnson used to turn up to news briefs and ask his fellow hacks “So what’s going on, and why is it bad for Britain”. The papers cheerfully blame Brussels for outrageous new EU rules, eating away at British sovereignty, er, sponsored by the British government. Johnson even railed against EU transport rules he campaigned for as Transport secretary.
Bashing foreigners is ever green, as a source of tabloid outrage journalism.