Protagoras, a Greek philosopher who lived in the 5th century BC, is often credited with being the first to articulate the idea of relativism.

Relativists argue that there is no one objective truth or morality that applies to everyone, but rather that what is true or moral for one person or culture may not be true or moral for another.

Cultural relativism is the idea that the beliefs and values of a culture are relative to that culture and should not be judged by the standards of another culture. In some cultures, it is considered acceptable to eat pork, while in other cultures it is considered taboo.

Moral relativism is the idea that there is no one objective morality that applies to everyone, but rather that what is moral for one person or culture may not be moral for another. For example, some people believe that it is always wrong to lie, while others believe that it is sometimes acceptable to lie in order to avoid causing harm.

Critics of relativism argue that it is too subjective, too vague, and too nihilistic. They argue that it is impossible to know what is true or moral if there is no objective standard of truth or morality. They also argue that relativism leads to nihilism, the belief that there is no meaning or purpose in life.

Plato is not a relativist because he believes that there is an objective truth and morality that exists independently of the individual or culture.

Protagoras is a moral relativist because he believes that there is no one objective morality that applies to everyone, but rather that what is moral for one person or culture may not be moral for another.

Protagoras is a cultural relativist because he believes that the beliefs and values of a culture are relative to that culture and should not be judged by the standards of another culture.

Epistemological relativism is the idea that there is no one objective truth, but rather that truth is relative to the individual, the culture, or some other factor.

Critics of epistemological relativism argue that it is too subjective, too vague, and too nihilistic. They argue that it is impossible to know what is true if there is no objective standard of truth. They also argue that epistemological relativism leads to nihilism, the belief that there is no meaning or purpose in life.

Protagoras is an epistemological relativist because he believes that there is no one objective truth, but rather that truth is relative to the individual.

Protagoras is a cultural epistemological relativist because he believes that truth is relative to the culture.

Protagoras is a moral epistemological relativist because he believes that truth is relative to the individual and the culture.

Metaphysical relativism is the idea that there is no one objective reality, but rather that reality is relative to the individual, the culture, or some other factor.

Critics of metaphysical relativism argue that it is too subjective, too vague, and too nihilistic. They argue that it is impossible to know what is real if there is no objective standard of reality. They also argue that metaphysical relativism leads to nihilism, the belief that there is no meaning or purpose in life.