Nobody is linking BREXIT to everything and everyone. Tut tut! Yet another exaggeration. We haven't even started negotiations yet and most of the ills in society are down to governments, who conveniently like to offload blame. It isn't the so-called 'faceless bureaucrats' who are responsible for austerity in the UK - it's our government. The unelected bureaucrats are no more responsible for EU laws than the British civil service.
You are almost certainly correct, roses, that a minority of people in the UK are racist. It doesn't make it any better that some countries are even more racist. We're supposed to be better.
I don't think anybody is stupid enough to think the opportunity for a referendum turned them racist overnight, nor that everybody who voted Leave is racist, although every racist almost certainly did vote Leave.
People who voted Leave must have known that they were voting the same way as racists, just I knew that I was voting the same way as most of the captains of industry and finance and 'experts'.
What Brexit seems to have done is give some of the racist yobs confidence to express their bigotry, as a sort of celebration of victory.