I have noticed that advanced mono lingual speakers (ie with higher education or some experience analyzing language) are aware of a huge amount of nuance and mea

I have noticed that advanced mono lingual speakers (ie with higher education or some experience analyzing language) are aware of a huge amount of nuance and meaning in their language encoded in small inflections or grammar. They are thus not always good at narrowing down to the simple thing the accented foreigner is trying to say. It seems to require some 2nd language learning experience to realize “the 2nd language speaker is probably not advanced enough to know rare idiom X, therefore he probably means much more common idiom Y but has the grammar off.”