When it comes to family, work colleagues, neighbors and friends, mature Christians can and should treat each other with respect and not try to win our points with anger or self-righteousness over Christians of other denominations; rather, softly espouse our own view once, and then change the subject to how we can all best focus on The Great Commission of converting the uncoverted.
As it says in 1 Corinthians, "for now we see through a glass darkly..." Even great theologians disagree on small points: but the main and overwhelming point is our miraculous salvation in Christ through the Cross, and the forgiveness, mercy and peace that comes from accepting Him.
Same here. I don't recall any brawls erupting at the holiday dinner table. :)