Hahaha our government literally designs our school programs to teach us from childhood that our experiences are the standard! We are deliberately taught that we are standard and everywhere that isn't exactly the same is backwards and primitive! We don't get taught that Africa actually has many highly technologically advanced metropolitan cities, no, we get taught it's NOTHING BUT HUTS. We don't get taught about any Asian nations except for Japan (technologically advanced but not as cool as America) and China (evil and gross). We barely learn any history or geography compared to other nations, and what we do learn is filled with lies and misconceptions. This thing where we can stream programs from other nations and talk to people across the world is relatively new! Ten years ago, we wouldn't have had anywhere to do that easily, to see for our own eyes that our goverment and teachers filled our heads with nonsense.
It's a campaign of nationalism and colonialism justification that our goverment makes mandatory and it starts from the moment we step into the school building until the moment we graduate from our final lessons near adulthood.
You're right, we do think our experiences are universal. Because we are deliberately taught that America IS the universe, and to think otherwise is treason. Our government hides the truth from us and we just...we're taught you don't exist. And it is so difficult to find reliable information on what your experiences ARE, what your culture is like, what your country is like. Google is full of all kinds of people saying things, some lies, some true. And we have no way to tell what's what.
By all means, keep making fun of the absolute hellhole that is America. But understand that this ignorance was done to us on purpose. If you know a stupid American, tell them about your culture! Help us be less stupid, if you feel like it!