Carlson said Jill Biden was 'borderline illiterate' and 'not very bright'
He cited Jill's 2006 Ph.D. dissertation, which he said was 'full of typos'
That year, Jill Biden earned a doctorate in education from University of Delaware
Earlier this week, a Wall Street Journal op-ed said she should drop 'Dr.' honorific
Joseph Epstein argued that 'Dr.' should be used for someone who's a physician
Op-ed prompted backlash with Journal being accused of sexism and misogyny
Fox News host Tucker Carlson blasted Jill Biden as ‘borderline illiterate’ and ‘not very bright’ because of errors in her Ph.D. dissertation that earned her a doctorate in education from the University of Delaware.