Dont worry, Donuel, the level of surprise is about that when you realise someone does not know something that you naively imagine everyone (in your culture knows), like finding wonderland down rabbit holes, or roughly where the capital of their own country is. When you meet someone who doesn't, it is a bit of a jolt.

In this case we are not even talking about Trump, but about the basic principles on which America was founded. You would hope Americans know that, so it is always a bit of a shock when you meet ones who don't.