Arguments pertaining to moral subjectivism or absolutism are difficult to navigate. Both positions have elements of truth weaved throughout to such a degree that is difficult for some to pick one. Others hold fast to one ideal or the other without ever conceding any validity to the other position.
Any conceived idea always has an element of truth. Some are closer to what is real than others, but each have a truth mixed into the concept. Approaching the topic with this in mind one can navigate the waters of moral philosophy with greater ability to perceive a more accurate perspective on the matter.
The extremes always lend themselves to showing their flaws. On one extreme is the moral subjectivist who maintains with absolute certainty that morality is one hundred percent subjective. This position is usually maintained by those who believe it is impossible to know anything for certain from any external compass and therefore it is imperative to be certain that we cannot know anything for certain. The philosophical trappings are apparent.
Notwithstanding, the tendency to discount the entire proposed philosophy due to this error of extremes does an injustice to the topic. Many throw out the baby with the bath water and refuse to allow any acceptance of subjective morality.