God is not a relativist, therefore if you are doing that then you are mistaken. I didn't have time to explain it then, but I want to clarify it for you that he was misunderstanding what moral relativism is. Moral relativism doesn't have to do with relative circumstances, it has to do with relative people. In other words, it has to do with the subject that holds the moral view, not the circumstances themselves. Let me broaden this a little bit so it's clearer.
Relativism holds that moral truth is subjective to the person who holds the truth.
In other words, I have a belief about what is true for me and you have a belief about what is true for you. I may think premarital sex is fine, you may think it's wrong. You have your morality, I have my morality. That's what relativism is. Moral viewpoints are relative to the person who holds them, or relative to the subject who holds them.