If morality is subjective, it is meaningless.
Robin,
Would you give me a sense of how you understand "meaning" and "meaningless". I take "subjective" to apply to contexts, think Einstein's ideas on frames of reference and relativity. "meaning" is then a function in a context but signs, gestures, even values can easily function differently in different contexts and yet be valid in the context and hence meaningful.
My ultimate concept is non duality and that implies that subject and object is an illusory artifact of the ego process so ultimately I would deny that anything is objective or subjective because there is only All That Is and hence there is no object or subject so we can't even speak about objectivity or subjectivity.
lfen