hawkeyefan
Legend
I'm not looking for ways to say no. Quite the opposite. They just have to make sense in-fiction as well. I'm not going to allow ridiculous situations to occur just because a rule says something. That's the purpose of the very repeated advice to the DM that the rules serve the DM, not the other way around. It's an admonition to the DM to follow the rules until the rules hit a snag, and then to unsnarl them the way the DM feels is best for the game.
I would say that your take on "ridiculous situations" to include a noble being diplomatic and hospitable to another person they believe is a noble is exactly "looking for a way to say no". It's a perfectly plausible and believable outcome of such an interaction, but you are placing your preference... your perception of your world as "more realistic" than that... above the player's ideas and the rules of the game.