Confirmation bias is a real problem.  We all demonstrate it at various points. Generally, though, one ignores opinion and analysis from the media that interfere with one's beliefs.  I find it harder to explain those who are able to ignore demonstrable facts that contradict their beliefs.  To whit, I was very interested to read that some 30% of Trump supporters believe that Jared Kushner never met Russians for any reason, despite Mr. Kushner himself saying that he did.  It certainly gives credence to the notion that they are living in alternative reality.  I wonder how you might explain it.