As others pointed out already, Mongols are very polite and friendly to visitors. Even people who want to tell them how to live in their own steppes.
And yes, that is hubris.
Also, your comment shows are very deep and troubling lack of empathy. On top of quite a large amount of ignorance.
So yes, hubris is a rather good word for that kind of behaviour.
Even if I had the urge to judge them on whether or not they were showing hubris in that situation, I would have to conclude I don't have enough information to do so.