It would drive me nuts too. I’m a very forgiving audience, except when I’m not–I can gloss right over what I believe to be an error in world building, if the story and characters are sufficiently engaging that I just don’t care. But make an error before you’ve got my heart and you’ve lost me.
So: how did people talk to each other in the Olden Days? How did they talk about each other? When did the new informality, if I may call it so, become a Thing? As so often happens when such questions are raised, I turned to Emily Post.
I have an absolutely wonderful edition of Miss Post’s Etiquette from 1947 which reminds me that, while standards were much looser than they had been a hundred years before, there were still rules to be aspired to. By 1947, people in the same age group and social set used first names all the time: “Muriel Manners, for example, taking a friend to the Country Club, greets a group of friends with ‘Hello, everybody. This is Sally.’ In the modern fashionable world the titles Mister, Missis, and Miss are literally never said except to outsiders.” Hidden in all this is the code for belonging: you call someone who belongs in your set by their first name; you use a honorific with someone who doesn’t belong. By the same token, if you were introduced to someone you didn’t want to “belong” to, you might insist on calling them Mister or Miss, and being called Miss or Mister yourself.
Post goes so far as to point, with amusement, at those crazy kids in the Gay 90s who called everyone Miss and Mister all the time. “… every debutante, aged eighteen, was called “Miss” by all the young men who were introduced to her after her ‘coming out’, even by her most devoted beaux–aged nineteen to twenty-odd! She in turn called them “Mister,” not only until she knew them better, but for life, even though she might see them every day. Only when a man and a girl became engaged did they call each other by their first name.”
So we look at 1947 and find it weirdly quaint and formal, and Post was looking back to 1897 and finding it weirdly quaint and formal. A basic of world building is that custom–especially social custom–changes over time. A few years ago when I was writing Sold for Endless Rue, set in what is now Italy, in the 13th century, I realized that I needed a salutation for two peasants who run into each other. These days it would be signore, but technically that means lord. And believe me, in a world where there was nobility and there was everyone else, nobility was touchy about anyone using a title they weren’t entitled to. So what would they say? I did research. I asked academic folk. I got nothing. I wound up skirting the issue. I couldn’t have them say “signore” because it undercut the world I was building.
So much information can be packed into the use of Miss or Mr. In Pride and Prejudice, Mrs. Bennet calls for Hill, the housekeeper, (not Mrs., although the staff would have called her so) but the maids are called by their first names. Jane Bennet is referred to as “Miss Bennet”–she’s the eldest. Elizabeth and the younger sisters are all referred to as “Miss Elizabeth,” and so on. If everyone flung first names around how would you know who fit where in society?
I read historical fiction for a lot of the same reasons I read fantasy and science fiction: I want to be somewhere else, where the rules are different. I like figuring out what the rules are from clues in the text. It’s part of the fun. For other readers the fun might lie elsewhere: in the history or the clothes or the language. But it doesn’t hurt to get the clues right.
*On the other hand, one did not use an honorific to a servant unless they were old enough to warrant it as a mark of respect. Otherwise a servant was called by either first or last name (insert elaborate rules here), and one did not introduce a domestic employee to a guest–but one could establish their name for the visitor: “If you’ll just give your coat and gun to Spriggins, he’ll make sure the bullets are removed.” So many rules.