I would take ‘subjective’ as meaning relative, and ‘objective’ as real, following the philosopher Plato and also ordinary usage. One thing is custom, or opinion (doxa in Plato), which varies, and another universal principles, which do not – man is man everywhere, whatever the cultural habits or customs, which are relative. One such principle is the golden rule, which is the same as Kant’s categorical imperative (Don’t do unto others… Treat man as an end, not as a means). Ultimately, that dichotomy (objectivity/subjectivity) is false. What is good for me is good for all humanity, and viceversa. ‘Good’ not in terms of likes and dislikes, that is, in a relative sense. The first principle is the principle of unity, which is neither subjective nor objective, but total, that is, universal. Humanity is one, as life is one.
From Quora (answer to Question)