Terms such as 'good' 'bad' 'right' 'wrong' are not universal truths

There is a good deal of irritation with the moral pieties of PC Culture so let us look at the relativism inbuilt to such certainties,

There is the argument that what people consider right and wrong is shaped entirely - not primarily - by the traditions, customs, and practices of their culture, accepting this lead us into the facts of moral and cultural relativism.

There cannot be any higher moral standard than that provided by the local morals of a culture, no trans-cultural judgement about the rightness or wrongness of a culture's morals could possibly be justified. 

There can be no ought from relativistic premises

So let us delve into this:

 Moral relativism may be any of several philosophical positions concerned with the differences in moral judgments across different people and cultures. 

Descriptive moral relativism holds only that some people do in fact disagree about what is moral; meta-ethical moral relativism holds that in such disagreements, nobody is objectively right or wrong; and normative moral relativism holds that because nobody is right or wrong, we ought to tolerate the behavior of others even when we disagree about the morality of it.

Not all descriptive relativists adopt meta-ethical relativism, and moreover, not all meta-ethical relativists adopt normative relativism. Richard Rorty, for example, argued that relativist philosophers believe "that the grounds for choosing between such opinions is less algorithmic than had been thought", but not that any belief is as valid as any other

Meta-ethical moral relativists believe not only that people disagree about moral issues, but that terms such as "good", "bad", "right" and "wrong" do not stand subject to universal truth conditions at all; rather, they are relative to the traditions, convictions, or practices of an individual or a group of people

Then there is Cultural relativism  - the idea that a person's beliefs, values, and practices should be understood based on that person's own culture, rather than be judged against the criteria of another.