They have been conditioned to believe that the mainstream media is evil and constantly lies to them in order to facilitate the woke communist takeover and destruction of the USA.
So it would be an understatement to say they are working from a position of willful ignorance.
I too struggle to believe it is possible, but I also know from direct observation that it is not only real but widespread.
This is Poe’s Law that you’re running into, where parodies of extreme views become indistinguishable from the real thing because the real thing is so ridiculous. So even if this specific example was fabricated by some random internet person, the same thought process works for millions of Americans.