Relativism and Inequality

The big problem I see with relativism that a lot of people can also see, it seems to me, is that a lot of cultures have rules of conduct that presupposes that people are not equal, and that some people are to be treated as inferiors. Relativists want to say that all cultures are created equal, but in order to accept that, you have to accept cultural norms that presuppose that there are superiors and inferiors.