Hi Josh,
First of all we need to point out that there are 3 types of moral relativism:
Descriptive, Meta-ethical and Normative.
http://en.wikipedia.org/wiki/Moral_relativism#Variations
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One cannot disagree with descriptive moral relativism, it is a reality.
Meta-ethical moral relativism is easily refuted as if there is not such thing as good and bad, right and wrong, just and unjust etc. then those who support this position ought to refrain from making any value judgements/comments and from using such words.
Normative moral relativism is one step further and it is even easier to refute as it is unattainable. It argues that “we ought to tolerate the behavior of others even when it runs counter to our personal or cultural moral standards” No man has ever been able to do this. For example, in not choosing to befriend a person one is showing intolerance towards that person.