Areas where there is great contention or disagreement are areas of great importance.
You may disagree strongly with someone on the matter being contended, but never forget that there is more at stake than merely fighting over ketchup versus mustard.
There is always a reason and a major foundational truth being battled over that causes huge differences in opinions.
It is in these matters that we must not disengage, discount, or avoid difficult discussions. It is in these matters that we must know why we believe what we believe and be willing to stand on that critical belief with honor (within and towards others). Learn to disagree and stand for truth without needing to belittle someone else in the process.
If you stand on truth, you don’t need to “strengthen” your position by belittling or disrespecting another.
Learn to just stand on the truth; it’s fully capable of holding you up on its own.