At the weekend BBC2 showed again their documentary about the London Palladium. In one section Yul Brynner was mentioned for being very difficult to deal with. It was no "Yul'' but "Mr Brynner''. It shows how celebs and our impressions of them can vary greatly.
This doesn't surprise me. I read that Meryl Streep can be a bit of a tyrant with her crew and staffers (and they've come to expect it) but she's an absolute doll to ordinary people.
I think some of the stars just push their staff hard. The expectation is different with ordinary people, whom they may feel a little more charitable towards.
I don't honestly think being asked to call someone 'Mr' rather than a more familiar first name is that bad tbh. Some employers don't want the familiarity with staff. Though I could imagine 'Mr Brynner' being fierce difficult to work with at times.