I disagree that it's wrong. It's just like different pronunciations. For schedule, we Americans say sked-jul, and the British say shed-yule. Neither is wrong. It's the same thing with spelling. When I see colour or zed, I don't think, "That's wrong because I grew up with color and z," I think it's charming.
I guess this strikes a nerve with me because I once had a girlfriend who told me that Californian English was the purest form of English next to British English, and so she spoke "better" than me because both her parents were raised in California, whereas even though I was raised in California, I picked up some of my mother's pronunciations from New York, which were "wrong." Of course, I believe neither is superior, they're just different.
I believe it's the same thing with the Spanish spoken and written in Spain and the Spanish spoken and written in Mexico, or Cuba or Argentina. I'm sure there would be some differences in spelling, pronunciation and word usage.
Even within one country, these things are known to change over time. Look at English from the time of Shakespeare, which if I'm thinking right, was around the same time that English colonists started settling in America.
Both British English and American English are very different from that today.
With your France, the Netherlands and Germany argument, I agree that I would go with the Frenchman's pronunciation. However, French is not the promary language of the Netherlands and Germany, wheras it is the primary language of both England and America*, so it's sort of an apples and oranges comparison
.
*Wikipedia lists it as "the de-facto national language", though of course, many other languages are also spoken in the U.S.