The explanations keep changing and are getting confusing.
First, we just don't understand because we don't know the difference between regular travel photos and art.
(pretty interesting assumption).
Then, it doesn't matter whether or not it's art because anyone has the right to keep their own property.
Both of which still miss the fact that no one is suggesting that the photos be taken by force. The photographer is always allowed to say no. And the travel companion is allowed to think that that is a bit odd.
In fact, the only thing being stated in this thread on this side of it is that certain people would find the refusal odd. Nothing more. Yet words like "not obligated, not entitled, my property, my rights, my art" etc keep getting thrown around as if anyone is even remotely debating a photographer's right to keep their photos. We all agree that it is your property and you can keep it.
I think the only thing the travel companion did wrong was to expect the photos without asking nicely first. I think anytime someone asks for something they do so with an expectation of at least possibly getting a yes, otherwise we would never ask anyone for anything! So I don't think an expectation of probably getting a yes is wrong or "entitled", but I do think asking nicely is required. Of course, he should take no for an answer and not push. But I can understand why this didn't go down well, since the OP herself admits that she had a hard time giving a straight answer. When someone won't give a straight yes or no answer, it is frustrating for everyone involved.