Dude is clearly intimidated because he is a fan. He's asking some real, tough questions about their history and in typical band fashion they don't want to engage. That's when you just say "thanks for stopping by fellas, I'm sure your fans REALLY APPRECIATED this enlightening interview". That normally gives them a quick 'check your ass" moment and something constructive might happen.
It also didn't help his mush mouth is BEYOND ridiculous...