I know the brain is beset with biases and blindspots of all kinds. But how profound is our mental resistance to information that contradicts our ingrained ideas?

Is there an information kill-switch in the brain that causes us to disconnect from ppl/media that are trying - even with facts and logic etc - to tell us something we (really) don't want to hear?

What evidence for these kill-switch(s) is there?

Is this guy correct, or a schizo?
https://streamable.com/skaqju