Is it not true that when entering the US you are required to show all your social media content on request, and if there is anything negative about the current administration, you can be denied entry (if you are lucky, and not detained for an indefinite amount of time)?

Truly exceptional indeed. You are basically on par with China.

Do they really do that and what do they do when you say you don't have one? Do they believe you or not having one is as suspicious as having one with the content they don't like?

This is just fake info, I was in China previous year and noone entering or exiting was required to show anything except passport.

FWIW, you don't have to do any of that to enter China.

only to exit

Not true also.

if you say so

The EU is really more middle-of-the-road in most things, while the US tends to be more extreme: more really good ideas, but also more really bad ideas. But that is also the result of the EU being largely controlled by bureaucrats and compliance officers instead of real leaders.

Yeah. Try to enter US as EU citizen and see how good it is. Immigration officers are in bad mood (to say lightly).

FYI American exceptionalism is stuff like having, bar none, the worst school shooting rate in the world, and by far the highest murder rate in a developed country, and stating that what everyone else is doing wouldn't apply to the US. Or designing cities wrong and saying that everyone else doing better by any imaginable metric wouldn't apply to the US.