Well, as someone who has lived in various parts of the U.S (mainly Utah, Oregon and Northern California), as well as Germany, Denmark, and is married to an Italian: Germans, Danes, and Italians often have a lot of cursorily formed opinions of the U.S, while in the U.S if people have strong opinions about the EU (and not actual familiarity) they are often not just wrong or stupid but also just as often completely unhinged from reality.
I'm guessing this is due to stupidity manifesting in different ways in their respective regions.
Like apparently the UK bring a knife-ridden crime epicentre, when the knife-crime rate is, while unacceptably high, actually rather lower than the US, and that's before you consider guns which are about 10 times more on top of that.
(And let's please at least pretend that the UK is still in the EU for argument's sake :)
I'm guessing this is due to stupidity manifesting in different ways in their respective regions.