You shouldn't. Since that's nothing close to what he says, you might just learn something by listening. Haidt is pretty fair and non-judgmental. If anything one could use his talk to say conservatives are using a more balanced consideration when making moral decisions. Using five factors instead of just two.
Haidt's ideas are widely discredited among academics in sociology, psychology, and philosophy. He's peddling pseudo-science that just so happens to make conservatives seem more 'balanced' than liberals.
Sources? I'd add that even if you can show he has no support in the academic world, his framework has been a life changer for me in how I relate to and negotiate with conservatives.