>"I appreciate your time, but I don't think I'm a good fit for _company name here_."
I would also suggest this; it signals to the other interviewers that they just lost a potential candidate because of John Doe's behavior. They might take action, but they need to understand the consequence of having that guy on the team, or at least in the interview room.
Would "I don't think your company is a good fit for me" be better wording (to show it's not your skills but their culture), or would that be too aggressive?
And perfectly fitting in such a situation. Being polite and professiobal avout breaking an interview of doesn't mean you cannot be "arrogant" doing it.
I would also suggest this; it signals to the other interviewers that they just lost a potential candidate because of John Doe's behavior. They might take action, but they need to understand the consequence of having that guy on the team, or at least in the interview room.