What I see at the beginning of that video is somebody who doesn’t want to spend the energy answering a complex question. Then, in the process of dismissing the question he gets drawn in and can’t help himself from really getting into it.

I don’t know anything about Feynman beyond vaguely associating his name with science, but watching this makes me want to seek out more from him.

You're in for quite a treat then. It sounds like you might have more of an interest in his technical work and scientific contributions and teaching materials (of which there is plenty, and of high quality), but personally I quite enjoyed this book of his as well: https://en.wikipedia.org/wiki/Surely_You%27re_Joking,_Mr._Fe...!