Dave Weldon is a man who embodies "Go with the Flow". He is a very ambivalent, apathetic person who is very honest about his thoughts and opinions, similar to Stephanie. 

He is completely willing to correct a fallacy that he detects in literally anything, whether it be logical or grammatical. He has tendencies to attempt to defend himself when he is being questioned and he definitely is defensive when it comes to his personal life, specifically his ex-girlfriend.