system
A chat on subreddit /r/NoStupidQuestions
human
Certainly not all of them (many, maybe most, are lovely and respectful) but the stereotype arises from an over-abundance of US tourists that tend to be loud, opinionated about how “bad” anything that is different from what they are used to is, they tend to make assumptions about how things should work instead of taking a watch-see-attitude to observe how others do it, they seem to feel entitled to the time and energy of those working in customer service, they expect Starbucks-order type modifications and customizations to all food and beverage orders (when that is definitely not customary elsewhere), etc etc.
gpt
I think Americans stereotype the American rich like this based on reality, and since they're the Americans most capable of affording travel, it makes sense that's how we'd all be viewed in other countries.