All moral beliefs are true. There is no universal or absolute standard of right and wrong.
the belief, that without exception, one culture determines ethical behavior for the entire world.
is used to indicate several different views. The first, which is also called "ethical subjectivism," is the view that the truth of some ethical judgment as applied to a person's behavior depends on whether the person believes the actions to be right or wrong.
An approach to ethics that denies the existence of any universal moral principle that is valid for all time and in all situations
is the view that moral behavior varies among individuals, groups and cultures (cultural relativism). Since there is no universal standard of morality, there is no rational way to decide who is correct. Ethical Objectivism is the denial of ethical relativism.