You two should go to couples therapy. No joke. The alternative: you let this disagreement remain and be a daily mini-stressor for the rest of your lives.
1. It's not about the disagreement. It's about what's behind the disagreement.
2. Many people cannot or will not discuss matters amongst themselves. Getting an impartial third-party engaged (and one who doesn't have a stake in future relationship(s) with the disputants) can have a hugely useful "unsticking" function.
Mind, there are many therapists and therapy methods, not all work, and some practitioners are incredibly ineffective.
Or it could be the thing they joke and laugh about how different they're from each other. Taking extreme absurd examples at each other. Maybe even recording a TikTok video.