Can you imagine living in a mind frame like that?

The speaker was commenting on another person’s political statement that was based on a lie rather than fact.  It is a rare, three-way malaphor, combining “frame of mind” (mental or emotional attitude or mood), “mindset” (a person’s attitudes or opinions formed from earlier experiences), and “living in a world of (one’s) own” (consumed by one’s thoughts or imagination).  A big thanks to David Barnes for hearing and spotting this unicorn in the malaphor wilds.