Two things.
In almost any discussion of politics, the first thing that is lost is perspective. Some issues are of huge importance but most are lesser issues where the outcome will not be profound one way or another. And yet it seems the “heat” of political discussion has no relationship to how high or low the item under discussion is on the scale of important decisions.
The other point that gets lost is that just because I may disagree with someone does not mean they are wrong. And yet in political discussion so often the parties seem determined to prove the other wrong rather than convincing the opponent that the speaker is right. The “seed” which grows into bipartisanship is the predicate that although we disagree on an issue that does not mean I am right and you are wrong. It merely means we disagree.