I've always been puzzled by the fact that so many people see Feynman coming across as a jerk or something like that in this clip. I think it's because ordinary everyday English language doesn't have a good way to tell someone that their <i>question</i> is wrong—that it's assuming something it shouldn't, and the assumption is what should be questioned instead. It's curious that even when asking for new knowledge, people can be affronted by the implication that they don't know what they're talking about. Physics is hardly the only field where you learn that the everyday understanding is an oversimplification, and a beginner being misled by those oversimplifications has no reason to be embarrassed.