Agree to Disagree

There are some issues that simply come down to personal choice. You like mayo. He hates mayo. There's no right or wrong there. You can try to force him to like mayo - but really, in life we are all different. We should respect each other's differences.

Just agree that she has her quirks and he has his quirks. You feel differently about the issue, and that's fine. You both do NOT have to agree 100% on issues. There's a reason that even close families often do not discuss politics or religion at the dinner table. Agree that you each have a point of view and that they differ. It is not your job in life to turn your partner into a clone of you.