This problem can cut both ways. Ie. if one dismisses the other person as the political equivalent of a "flat earther," they're not questioning their own assumptions or seeking to understand why the other person could feel something so strongly.
Having lived in both deeply red and deeply blue states in the US, I think most people aren't as crazy or as far apart as they think they are. But many of the people who have lived their whole life in one camp have been trained to think that the other side is literally crazy, and that's a convenient excuse to be afraid of them and not bother seeking to understand them.
" Intractable conflicts feed upon themselves. The more we try to stop the conflict, the worse it gets. These feuds “seem to have a power of their own that is inexplicable and total, driving people and groups to act in ways that go against their best interests and sow the seeds of their ruin,” Coleman writes. “We often think we understand these conflicts and can choose how to react to them, that we have options. We are usually mistaken, however.” "
" Once we get drawn in, the conflict takes control. Complexity collapses, and the us-versus-them narrative sucks the oxygen from the room. “Over time, people grow increasingly certain of the obvious rightness of their views and increasingly baffled by what seems like unreasonable, malicious, extreme or crazy beliefs and actions of others,” according to training literature from Resetting the Table, an organization that helps people talk across profound differences in the Middle East and the U.S. "
If you're looking for it, you'll see this behavior everywhere online, including HN, and it's getting worse.
Some ideas are so idiotic - like flat Earth belief - that one should not waste their time engaging with said ideas. There are people who deny that Sandy Hook happened. I see no need to understand such fools.
Having lived in both deeply red and deeply blue states in the US, I think most people aren't as crazy or as far apart as they think they are. But many of the people who have lived their whole life in one camp have been trained to think that the other side is literally crazy, and that's a convenient excuse to be afraid of them and not bother seeking to understand them.