As an American, sitting down next to a European on vacation for more than a few minutes is never fun. Once they inevitably ask "Where are you from?", they follow it up with a lecture on American politics before I can even finish my sentence. It's tedious and it's nothing new.
It's probably way more frustrating for people having to listen to their boss lecture them at work about how screwed up a country they've never been to but you've lived your whole life in is. You're not in a position to just politely say "bye" and never see them ever again without any consequence. You certainly can't speak up against them because they're in a position of authority.