He doesn’t strike me as angry as much as amused. This is probably not the first time he has been asked a very similar question. Maybe the first time he was annoyed, but what he actually does is explain the big picture, “why?” The question asker isn’t thinking big picture. He needs context. This person may never get it, but it is important for leaders to be able to convey direction.

It is the same struggle that Woz had regarding the Apple II. Woz was looking at all of the success the Apple II had and was still having and Jobs knew it would not last forever and he had to create the next thing and that that is where the company has to put time, money, and attention.

I think he was angry too, but that makes it all the more impressive.