This probably lies at the core of American culture being the best representation of a "peach culture" - superficially very friendly but inaccessible and hostile at heart. Americans only to be friendly as not to get into (shooting) fight with each other but not as friendly as to have to sacrifice for or share with others who they don't approve because they have almost never had the need to do so while in old cultures this type of cooperation was a necessity whether you liked someone or not.
That is not that bad here in Europe. But still, you shouldn't take Westerners you just met at their face value. As far as I see most immigrants from outside of the West never get this. The facade of friendliness is the default here, unlike in Asia. A smiling face or, in the US case, small talks never mean that the person in front of you is not hostile to you.
As far as I see, the biggest red flag immigrants almost always miss is the refusal to clear misunderstandings. Like how a lot of Americans think all Chinese food is greasy or there is a war in Turkey, etc... If someone has such a generalizing bad opinion and that opinion doesn't change regardless of what you say, that person is hostile to you. That "We don't care about correcting our misunderstandings" is how modern Western passive-aggression works. Americans practice it a lot more. Most immigrants mistake it for innocent ignorance but it isn't. People who were born or grew up in the West have an instinctual understanding of how this works thus you have woke politics. This is why progressives obsess over tiny nuances. Unfortunately, all of this is also why you see immigrants from "third world" voting for Republicans in the USA. They take them at face value and they think progressives are dumb.
Another example is MIC2025, we took it as a "threat to global trade!" and painted it as an aggressive, dishonest attempt to "dominate" the world market, fuel neo-imperialist/expansionist military ambitions, and subvert the US industrial supply chain. Of course, we ignored that such an initiative is the obvious, sensible direction for a developing nation that is integrating itself into high-value-added industry and trade; and forgot that we had done quite literally the exact same thing (if not worse) for most of the cold war.
The US still does it. The most recent examples would be the CHIPS act and the Inflation Reduction Act. Pentagon also routinely subsidizes various industries. The Silicon Valley came into existence pretty much because of US military investment in electronics,