It’s almost as gloriously tone deaf as Cooking School. Ye Gods, who makes decisions like this?
Just as a literally tone-deaf person is unable to comprehend the differences between musical notes, a metaphorically tone-deaf person is unable to comprehend the different facets/nuances of a given situation. A statement such a person makes might also be described as tone-deaf.
It differs from words like ignorant because when you’re calling someone ignorant, you’re just calling attention to the fact that they do not know; whereas calling someone tone-deaf implies they’re incapable of understanding.