I believe the stubborn part. [Tony takes a drink and figures this is probably a futile thing on his part. It's not like if he knows the complete and overly detailed history of Steve Rogers/Captain America he'll be able to get along any better with him. He's not sure he wants to, anyway.] So you saved his bony ass and then there was a war and a magical potion and the tragic ending. Oscar-worthy for sure.
New subject! Let's hear your go-to pickup lines. I'm curious whether women could take more or less bullshit back then.