Japanese grammarian

This morning when I visited a Toastmasters club, it was difficult to understand a new-to-English Japanese woman describe to guests her duties as the grammarian for the meeting. Later, at the end of the meeting, when she gave her report on everyone's usage of the English language, she told one member that he had said "to who" rather than "to whom." She was correct in this usage that most Americans don't understand, and the audience erupted in applause and cheers.