If someone doesn't like Italian mozzarella, then they don't like mozzarella: what they like is some mozzarella-inspired thing.
The same goes for espresso. In Italy, espresso and coffee have been synonymous for over a century.
Yes, both a Moka pot and a full pressure larger machine handled by someone practiced can produce excellent coffee, but you cannot seriously expect espresso in an Italian city to compete with what is happening in Tokyo, Bangkok, Taipei, Vancouver, San Francisco, etc.
During coffee’s third wave the profession of barista emerged, and Italy took little part in this elevation of craft. There are people who have literally built a career out of what others (Italians included) dismiss as fuss.
Yes, Italy devised some of the original techniques, but that was about sixty years ago, with — I would argue — limited development since.
Drink fifty espressos each in Rome, Milan, (or the villages!), Tokyo, Bangkok, Vancouver then tell me where you think it is best.
(PS — Nice try, but no one says Italian mozzarella is bad; it is incredibly delicious by all accounts.)
When I was a kid, espresso was practically unavailable outside Southern Europe. In Italy, every household had, as they still do, a stovetop espresso maker. In Italy, every city corner had, as it still does, a bar serving espresso.
Whatever Italians consider good espresso, we - who grew up on filter coffee, which Italians do not drink - probably ought to defer.
Is there a better espresso somewhere? Perhaps.
Is it conceivable that Italian espresso is terrible? Nope.
The proposition is as absurd as claiming that Japanese sushi is subpar, or that Swedish dammsugare are the world's worst.
I can assure that at least since the 1970's there was hardly any household without a stovetop espresso maker.
The issue in my mind is the dogmatic orthodoxy of people who enjoy French or Italian espresso saying that anything else is borderline immoral, or at best "pretentious". I happen to prefer more modern espresso styles, but there's also joy in a good traditional Italian shot.
1970s, early 1980s in America: nowhere to get espresso except for fancy restaurants or italian neighborhood
Late 1980s in Pacific NW, America: quirky little Starbucks chain pops up. Ambience emulates a SF hippie coffee house, but they serve Italian-style cookies and espresso.
1990s, 2000s: Starbuck becomes gigantic corporation. Coffee culture fad spreads. Average American now knows what 'biscotti' are.
Today: "Italians make bad espresso"
And in a plausible future...
2050s: espresso fad long dead in America. Italians carry on same as ever, since coffee there, for generations, has meant 'espresso'
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.
Actually: diners! What a good example...
I would find it equally disrespectful if a Spaniard or an Egyptian posted something like "Americans have the worst diner food in the world."
Nobody needs to like the coffee or the pie in an American diner. But if they don't... whatever they like isn't really diner food.