The Latin proverb goes, "de gustibus non est disputandum."
A bag of my New Mexican pinon coffee beans says, "sobre los gustos no hay disputa."
Roughly translated, that'd be, "Don't let's argue about matters of taste." In PBR class last semester, we talked about how with the removal of moral absolutes, all that remains is personal taste. Since there must be commonality if people are to live together, taste is enforced as law.
Ironically, perhaps, having an absolute moral law--one grounded in God's character and applicable to every human, everywhere--frees ordinary mortals to have opinions, yes, and even to disagree.
That is why I uphold the right to differences of opinion. The atheist cannot say the same.