Tucker Carlson on Monday night joined the fray over Jill Biden's use of 'Dr'
Carlson said her PhD 'means basically nothing' and said she had 'status anxiety'
He mocked her for having the same qualification as Bill Cosby and 'Dr Pepper'
Carlson spoke after The Wall Street Journal on Friday published a scathing op ed
Joseph Epstein labeled future first lady 'kiddo', saying she should 'drop the doc'
'In the social sciences calling oneself Dr. is thought bush league', he adds
Jill Biden Sunday night hit back at a Wall Street Journal writer who mocked her
Opinion editor Paul Gigor on Sunday defended Epstein's piece as 'fair comment'