So expecting the ability to work is written is not something I consider trolling. Playing a character who is falling to live up noblesse oblige is something I consider trolling. Like part of taking that background is the implication that your character should hold certain values. You are taking on a particular sort of fiction here - I think you should be expected to honor it or at the very least I have a very good reason for why your character would be so brazen.
It feels like that's how I view Clerics, Paladins, and Warlocks and how they would be expected to interact with their deities, hierarchy, or patrons unless it was discussed in advance with the DM. Is taking the noble background with your expectations of what that means akin to taking one of those classes?
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Anyway, if it would clearly be bad to the DM/world expectations for a noble to do that, let's imagine a party without Sir Buzz. "And so we charm/geas/seduce Sir Buzz, is that his name?, into joining us on our journey to see the Baron, and then....".