I think of it as "mal-information". Malicious intent.
This began with Limbaugh. Not only did he tell them what to think, but how to think. Then he made the world binary, us vs. them. Then he convinced them that any information source that said things they didn't like was lying, 24/7/365, that nothing they said was true, ever. Just listen to me. And they did.
So this is the result. Literal competing realities.
I've been saying all along that these people really are at war. And in war, any lie can become "the truth" if it advances your side of the war.