Both sides can be pretentious. Dogmatic attachment to tradition can be pretentious just like overzealous modernism. I certainly wouldn't order an espresso in Milan and then be upset that I dislike it, but I would find it annoying that it's difficult to find a cup of coffee I do enjoy, just like my British friends find it difficult to find a cup of tea that meets their preference, which I also think is a sub-par way to prepare a drink.
Plus, the espresso fad is kinda already long-dead in America. Sure, there's Starbucks, but no one's really getting a black coffee or espresso shot there. If anything, America's contribution to coffee that has persisted for decades is drip coffee and more recently handbrew pourovers (though Japan and others also contributed a lot there). There's a reason the Americano is essentially just espresso made to taste like drip coffee.