The only difference is that the EU remained truthful to the free market while both the USA and the UK put country first closes.
> Crying now it's too late and a trade war can go both ways.
There are no trade wars. Both the USA and the UK have shown themselves to be extremely unreliable partners which will not respect the rules they profess to believe in as soon as it doesn't favor them. That was already obvious with Trump and is only more obvious now.
I fully expect the USA to lose its place as the main global power in the next decade if not sooner. The UK will probably pay the price a lot sooner as the EU is not going to forget and they have no other reliable ally.