It's not much a matter of genetics: it's just that - just to give you two examples of things I have lots of experience with - when we are talking of "Pizza" and "Espresso" a person who grew up (and learned to prepare food) in Italy or at least in an Italian family will have a different idea about how these things are prepared (or should taste when prepared).
Do I think that, for example, Pizza Hut pizza is rubbish? No, I like it, and it definitely has a place in the world, but it's not what we mean with "pizza" in Italy.
Do I think that Espresso prepared in 99.999% of the coffee shops/cafes/bistrots in the rest of the world is rubbish?
Yes, most definitely.
There are exceptions (I know of a place where they make excellent Espresso in Berlin, and neither the owner/store manager nor the baristas are of Italian descent) - but the rare times I had decent Espresso outside Italy itself it was almost invariably prepared by an Italian.
I suppose that this could apply to other specialties from different cultures: I am no Sushi snob for example, nor a Croissant Connoisseur... but I would expect that Sushi prepared by a Japanese chef, or French Pastry made by a French person could be a bit more faithful to the "platonic ideal" so to say.
There are exceptions (I know of a place where they make excellent Espresso in Berlin, and neither the owner/store manager nor the baristas are of Italian descent) - but the rare times I had decent Espresso outside Italy itself it was almost invariably prepared by an Italian.
I suppose that this could apply to other specialties from different cultures: I am no Sushi snob for example, nor a Croissant Connoisseur... but I would expect that Sushi prepared by a Japanese chef, or French Pastry made by a French person could be a bit more faithful to the "platonic ideal" so to say.