Well, the US has been having its consequences of a silly decision for president for a couple of months now (basically an inexperienced troll with a tentative grip on reality).
Now is the actual consequences of the group stupidity of the UK last June. A hundred reasons for doing it, half of them not logical (it was the conservatives who caused a lot of the pain suffered, but the EU got the blame)/"I wanted to hit out at Cameron" (by getting a worse deal for yourself?), and the rest seemed to end up with statements like "I love my country"(The Reich)....
I suspect what actually won it was the fact that a number of people just choose "Yes" by default, and don't read the question. Think of that, US, when you think your country is stupid.
But, despite experts and warnings, and 48% of the voters, it goes ahead. Which side of the country would you back? (*)
(* Pro brexit people would be claim that brexit had already happened, because it was the vote, not the trigger, that was Brexit. It isn't. Brexit is the leaving. Within the next two years. That's the bit the remainers were talking about the damage happening (**))
(** Also pro brexit people will point to the growth not dropping after the vote (as if brexit happened). Growth rising is a clear predictable immediate effect of a large currency devaluation, which happened when a lot of money was pulled out of the country. Of course they don't want to concentrate on the other predictable delayed effect, which is the dropping away of growth and rise of inflation, as all imports (including oil) rise by 30%. Inflation has momentum and will be with us much longer than that little growth spurt)