Ethical subjectivism is a philosophical concept that suggests morality is based on an individual's personal preferences or opinions. This view holds that ethical statements are not necessarily true or false but instead reflect the opinion of whoever made them. According to this theory, what is right and wrong can change from person to person since each individual has their own set of values and beliefs. Therefore, there cannot be one universal standard for moral behavior, as it will always depend on whom you ask and how they personally feel about a particular issue.
The main idea behind ethical subjectivism is that moral principles do not exist in nature; rather, they are created by people when attempting to make sense of the world around them. It follows then that if these principles were never established in the first place, no action would ever be considered immoral or unethical because everyone would have different ideas about what was acceptable behavior. Thus, ethical subjectivism allows for subjective interpretations of any given situation without having to adhere to some external rule or code of conduct that may conflict with someone's personal views and beliefs.
One major criticism against ethical subjectivism is its lack of objectivity. Critics argue that if morality depends solely on an individual's feelings at any given time, then it becomes impossible for anyone else to judge whether something done was good or bad since all judgments will be based entirely upon those feelings that could vary greatly between individuals depending on their life experiences up until that point in time (i.e., culture). As such, this type of thinking often leads people down paths where anything goes, regardless if it hurts others, simply because they believe their actions should only be judged according to their own standards, even though other members of society might strongly disagree with them due to their potential harm to another human being(s).
Proponents counter this argument by stating that despite differences among individuals regarding certain behaviors, there still exist basic fundamental principles (such as respect) that should remain constant across all cultures and societies, thus providing a baseline understanding between differing groups so conflicts don't arise unnecessarily over minor issues like dress codes, etc. Furthermore, supporters also add that just because we hold different perspectives does not mean our core values aren't similar; it merely means our interpretation thereof differs slightly from one another yet remains rooted firmly within accepted societal norms, making us ultimately accountable for our decisions either way, with positive or negative consequences included therein.