Nobody is saying that personality differences don't exist. Only that MBTI doesn't measure personality differences.
And yet we have this very odd situation where a member is criticizing her co-workers for not understanding personality differences. When it is as plain as the nose on your face, that no one here understands personality difference either.
It is a case of the pot calling the kettle, black.
It's not so much a question of them not understanding, but of we not understanding and thinking we do.