I live in East Asia, which is by no measure a cultural or technological backwater, and was surprised to hear my mother say, two days ago, "you must get YouTube over there...".
For some more perspective, I'm the most successful member of my family (from a financial pov) and from the condo I live in to the car I drive, I have nicer things than my parents ever did. I'm the first in the family -- and this is something I only considered just now -- to sends his kids to a good / expensive private school.
Though I don't lord it over them, my life is way more advanced / cushy than theirs. But from their point of view I'm not in the US and therefore don't have access to what they consider the gold standard of civilization.
And this point of view has not changed even though my parents have experienced my life in Asia first hand. Truly bizarre blind spot.
These days most people just ask if I've eaten a dog.
If it helps, think of every US state as if it was a european country. You might lazily think they are all the same but scratch the surface and there's a lot of difference.
So yeah, its fine for someone to say they're from California. You already know they're from the land of High Fructose Corn Syrup so why be nasty about it?
Compare it to Europe, where a 3 hour drive gives you different food, language, holidays, religion, festivals, type of beer, different political system, different history going back 1000+ years... and another 3 hour drive does it all over again.
It's only the Americans that think they're the center of the world.
I used to watch this Japanese show "Why did you come to Japan?" where a camera crew hangs out at Narita Airport and ambushes unsuspecting foreigners with that question and try to tag along on the journey of people they think are there for an interesting reason. When everyone introduces themselves they say the country they are from, except Americans who always say which state they are from and never the country. I found that particularly interesting. So, I just assume it's a deeply ingrained cultural thing to treat "America as default".