I think you hit the nail on the head here, Jack. How is it possible for someone not to be his/herself if he/she is always making choices.
In the context of this movie, I think that they are trying to ask Brad if he is being true to himself - when he puts on a front to make friends and succeed in business is he really acting the way he wants? The way he should? The way he thinks is right?
What do you think about this? Is his acting like this being himself because his strongest desire is to succeed?
Realistically, if I were to act in a way that I know that I wouldn't agree with, I would consciously acknowledge that and change that immediately. But, for arguments sake, I better have an adequate reason as to why I am acting a certain way. Hypothetically speaking, if I were in a situation where I have to defend myself against someone violent, as much as I would hate myself for hurting someone, I might have to.
How do you determine what is accceptable?