There used to be a sense that if you didn't address someone with the title of their expected role it was rude and disobedient, but we need to accept that existing relationships need to be handled with respect.
Madness string 111441
If you ever want to make yourself feel bad, just think back on something that had turned out to have been staring you in the face all along, and everything you did wrong while you'd failed to see it. Not really a productive use of your time, but we can't spend all our time being productive, now can we?