Who are you to say that? Moral Relativism on the Run
One of my classes never ends without a student bringing up moral relativism. I've said before here that the conservatives are wrong about "tenured radicals". Students don't learn how to be relativistic liberals in the university because of liberals; they seem to come to the university already believing that there is no such thing as a universal morality. One student told me the other day he thinks morality is even "personal"--each person gets to decide what is right and wrong. ( I told him that he had just earned an F for the class. He asked why. I said just because. I asked him if he thought it was unfair of me to do that to him. He said yes. I asked him what fairness could possiblity mean in his world where every individual gets to make up what is right and wrong.)
Peter Singer offers evidence to suggest that not only is there something like a global human ethic, but that there is moral progress. Fewer and fewer people around the world today believe that inequality based on race or ethnicity is justified. Gender inequality is still more acceptable,but less so than it was a few decades ago.
It may be the case that people only say they believe in equality when they actually do not practice justice and fairness. Singer cautions us not to underestimate the power of shaming the hypocrite. Ideals matter and if we can work to make them part of our everyday language and expectations, then we are contributing to moral progress.