A well-intended interpretation is: the parent comment advocates for a society where there is substantial language diversity even within smaller geographic regions. This makes sense from many perspectives, because forcing people to speak the same language no matter the context is not only hostile to immigrants but also to native minorities. E.g., in the North of Scandinavia (where I reside), many people don't like that the language that has to be spoken is traditionally (less now than historically) dictated by the South.