For the wizards depicted in the books, the Muggle world is like this whole other country, and the few who dare venture out of their own little pond seem to be in a constant culture shock. So, yes, I have no trouble imagining that JKR wrote about our world from the POV of a secluded subculture that has no idea or doesn't really care what happens in the world of the non-magical people because they cannot identify with them.
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