That she was "bored" by the exercise doesn't necessarily mean that she doesn't share you and your brother's bold, hard-driving, searingly intense curiosity about the world, and the nature of our ability to infer knowledge about it.
It might, instead, have had something do with the fact that the point you guys were trying to make was rather trivial.
Exactly. Nobody cares if the exact details aren't 100% correct in a non-technical discussion. Suppose I begin recounting a blog entry which describes an odd situation. I may not remember all the details right, but I certainly have the gist of it and can convey that. There is no point in someone stepping in and saying, "you know, it was actually in Des Moines, not Dallas," if the city is entirely irrelevant to actual content of the post.
What is the group supposed to do with that statement? Someone has to segue back to the original topic, while someone else just lost face. Most people will just either ignore the correction entirely, or just drop the topic altogether.
It might, instead, have had something do with the fact that the point you guys were trying to make was rather trivial.