Moral Relativism

Hello everyone.. This is my first of what I hope will be many postings in the evc forum. I would also like to apoligize in advance for my poor spelling.
As far as moral relativism goes I think the stock philosophy answer is that it is self defeating because it is a universal moral law that states there is no universal moral laws. That is not an original insight and im sure most people who feel there is any merit in moral relativism can ignore it with ease. While recognizing our surroundings have a tremendous impact on what is legal, I have never been comfortable with the idea that geography decides whats right and wrong. My disagreement is that mr assumes one culture or society can not be mistaken. There is a sort of circular logic involved with saying in country A abuse is permitted and in country B it is not, therefore it is right in country A and not in B. Why is mr uncapable of considering the fact that absloutely abuse is wrong, country A just has not realized it or does not acknowledge it.