Here's a paragraph from an essay that touches on this.
""... Then I learned that all moral judgements are "value judgements", that all value
judgements are subjective, and that none can be proved to be either "right" or "wrong."
-Ted Bundy
What of the supposition that there exists a public morality in the first place? Perhaps it is the case, rather, that morality is "in the eye of the beholder", as it were; something so subjective, in an abstract sense, that it should be in no way subject to legal regulation. This may be the simplest answer to the question "how ought we to act", as it offers definitional clarity (in that the meaning of "right" becomes "whatever each individual thinks is right") and appears to resolve moral disputes by suggesting that there is nothing to discuss, as each party is correct about morality, for him or herself. Though we might note that as a result the discussion of morality itself becomes something of a moot point, perhaps the moral subjectivist will be willing to accept this. Unfortunately, a number of other problems will arise. The most obvious of these is that we cannot criticize anyone's behaviour so long as they are acting in accordance with a moral principle they themselves hold. If Jane accepts the principle "I ought to kill people with blonde hair", we can hardly fault her for doing so. Essentially, if we accept that no single "value judgement" (as Ted Bundy characterizes ethics) such as "do not kill innocent people" can be shown to be right or wrong, then he is correct to allege that "if the rationality of one value judgement [is] zero, multiplying it by millions would not make it one whit more rational. Nor is there any "reason" to obey the law for anyone". While one might disagree with Bundy's principle that raping and murdering others is right, we have no cause to criticize him; he is as moral as Gandhi. Perhaps the greatest problem with subjectivism is that though it appears to solve moral disputes in society, as mentioned above, it in fact exacerbates them, as the wishes and beliefs of others need not have any bearing on the rightness of my actions. In essence, subjectivism fails to deliver us from the Hobbesian state of nature, which is, at its most basic, the function of a socially instituted moral system. If the moral rightness of something like homosexuality is relevant to the individual, and there is no reason to distinguish it from other actions, then morality loses both its purpose and its benefit to society. We cannot, therefore, conclude that private, subjective morality should hold sway." ...