I'm totally fine debating whether the sky is blue with someone claiming it's gray because it is usually overcast. I'm happy to entertain the motion that the sky could be bronze - with a reference to ancient Greece and pretty sunsets. At the end of the day we can just agree to disagree and move on.
But I'm not going to debate whether the sky is blue with someone yelling that the sky MUST be green because obviously clouds are green. They have moved so far from the truth that they are either arguing in bad faith or just plain delusional. Neither case is worth even the slightest snippet of my time: I'd have a better chance of success trying to explain my viewpoint to a tree. It isn't politics anymore, it has turned into religion or sports.