Well that was worth waiting eleven years for.
The teacher’s brief explanation, basis for such wisdom, fell on a deaf classroom as everyone sat dumbfounded by the initial declaration. This person expected us to believe the meanings are actually, in real life, seriously serious, the opposite of what the world had understood for centuries... By the end of that semester, I realized my choice of which University was in error.
I suggest we be wary of such word smudgings. This current culture of lies and denial includes the custom redefining (cancellation?) of words. Although somewhat subtle, the two words do indeed have different meanings; different applications.
I believe this is historically correct:
morals = what is ideal on a spiritual level
ethics = practical, functional in society, cross-cultural