We accept regional differences between dialects as a natural phenomenon.
There are actually quite a lot of regional dialects within the US, not even getting into the differences with how Canadians, Brits and Australians speak. Some such differences have stalled political negotiations and such historically.
FWIW: I speak conversational German but can't really follow the News in German and can't really read or write it. I read and write French a little but never developed an ear for it so I have enormous difficulty following spoken French and struggle enormously to put together a spoken sentence. I think there are substantial differences between written and spoken, formal and informal for any language.
There are actually quite a lot of regional dialects within the US, not even getting into the differences with how Canadians, Brits and Australians speak. Some such differences have stalled political negotiations and such historically.
FWIW: I speak conversational German but can't really follow the News in German and can't really read or write it. I read and write French a little but never developed an ear for it so I have enormous difficulty following spoken French and struggle enormously to put together a spoken sentence. I think there are substantial differences between written and spoken, formal and informal for any language.