You did not notice that both of your examples have nothing to do with “US defaultism” but just normal properties of shitty humans?

I’ve heard Britons and Singaporeans speak like this about English, and I’ve even heard people whose language is not even the “world language” like Germans or Italians speak like that.

Same with the currency thing, I’ve seen people do that same thing with Euros and Yen.

This is not a US-specific thing, it’s just a privileged/narcissistic/patriot human thing.