I'm willing to bet that he has more tact, and puts up with stupid social mores. He uses a lot of real scenarios from his life, and I think he uses it as an opportunity to speak his mind frankly on the matter.
I'm a HUGE fan of LD. My wife loves it too but probably gets sick of me quoting it constantly. My most used one is "Whaaaaa, milk and coffee! Who'd a thought!" it's pretty much my version of "Duh".