Good to see this topic has been allowed to stand in AIBU rather than being dispatched to the hidden cave elsewhere.
British exceptionalism is a factor. Better than anyone else, Blitz spirit, get rid of the foreigners, we are great, we can do it all alone, and we will face down those arrogant faceless bureaucrats in the EU deciding how we should live our lives. Sure.
As an island nation, isolating the country from a market as big as the EU is a disaster. Everyone knows it, but the Emperor's clothes and all that.
Those who voted for Brexit in my view generally fit in with the exceptionalist cohort, with many of them being racist also. Dreadful stuff.
No one likes to admit they were totally hoodwinked, no one wants a lower standard of living, no one wants rising prices, no one wants lack of choice. But it's the old grin and bear it from those who voted Brexit really. Never explain, never apologise, Britannia rules.
Like others, I still await the list of benefits to leaving. We will never know because no one will admit that there are none. Government approved approach too.