Regarding the topic of whether human morality is subjective or not I will say the following. Human morality is made by humans (not by a god). The morality that pertains to humans is not the exact same morality that pertains to nonhuman animals. The morality (or moralities) that chimpanzee cultures have is not the same in every respect as the morality (or moralities) of human cultures. In various human cultures the standards of morality in some of those cultures differs from that of some other cultures to some extent.
The web page at https://study.com/learn/lesson/moral-objectivism-subjectivism-relativism-overview-differences-examples.html says the following. "Subjectivism is when morality is not dependent on set rules or societal norms, but rather on the individual. An individual gets to decide what is good or bad based on their own principles, feelings, and beliefs." The web page also says the following: "Moral relativism states that morality is determined by a culture or a society, such as a religious group. Moral objectivism states that there is a set of valid rules and principles which should be adhered to by all people no matter what." At this time I prefer to not state if I think either of those three types of human morality are correct or not, since it is difficult for me to make a definite decision about such.
Determining what is moral or immoral in some specific situations is not an easy one for me to make, especially when it comes to deciding what morality to apply to people other than myself. For example, I am tolerant of people having certain lifestyles which I wish to never engage in. For example, I no longer consider it immoral (in some situations) for unmarried people to engage in sex with multiple unmarried persons, but I chose to avoiding engaging in that kind of sexual conduct. However, because I was raised to believe that such sexual conduct is always immoral (and because such a concept got deeply ingrained into me), I sometimes (such as when talking to my JW family) inadvertently refer to people engaging in such as immoral people.