Well, strictly speaking, "Mrs.", "Miss", "Ms.", "Mr.", "Mme.", "Mlle.", "M.", "Mx.", "Dame", "Sir", "Dr.", "Rev.", "Fr.", "Msgr." "Eng." &c. are not pronouns, they are titles. Whenever I've designed software that accepts a name and separates out the title, I've always explicitly made this accept an empty string (and usually put "Mr." some way down the list, not at the top); and I've always avoided supplying this information myself. I refuse to let myself be defined by marriage, so I'd sooner be Ms. than either Miss or Mrs.; but if I have used just my initials instead of a gender-obvious name, then I prefer just my initials with
no title. (If Britain thought more highly of engineers, I'd love to use "Eng." as a title -- ask me what the square root of -1 is and I'll say
j, and I know my 25.4 times table .....)
Pronouns are "I", "You", "We", "He", "She", "They" and similar; they can be nominative ("I", "We", ""He", "She", "They", "It"), accusative ("Me", "Us", "Him", Her", "Them", "It"), dative ("My", "Our", "His", "Her", "Their", "Its" -- note no apostrophe) or possessive ("Mine", "Ours", "His", Hers", "Theirs", "Its"), and you probably already knew all that stuff without knowing what any of it was called, unless you're some sort of cunning linguist; but pronouns are basically just a way of avoiding repeating the name of a person or thing. For instance:
Suzanne was walking along Main Street with Rusty, Suzanne's her Belgian Malinois, at the side of Suzanne's her body furthest away from the road. Suzanne She instinctively tightened Suzanne's her grip on Rusty's his lead as a lorry rumbled past Suzanne and Rusty them. Rusty would have been afraid of the traffic if Suzanne had not been with Rusty him. Vehicles were strictly a twolegs thing, alien to Rusty and Rusty's his wolf ancestors; but Rusty he trusted Suzanne, whomRusty he considered as the alpha bitch of Rusty's his pack, to keep Rusty him safe fromthe vehicles them.
You get the general idea; the pronoun is just short for the most-recently mentioned entity that it would match. Using too many pronouns can be confusing; you can't really write something like Becky was unable to leave the house when Suzanne called, as it was her Nan's last day and she needed to help her pack; but she did ask her if she wouldn't mind getting her coat back from the dry cleaners', if she was going into town, so she could give it to her before she went and expect anyone to be able to keep track of which "she" was meant by each "her", and therefore who was fetching whose coat for whose Nan.
There have been various attempts at introducing common-gender (i.e., either masculine or feminine) third person singular pronouns (which standard English doesn't have) but none of these seem to have met much widespread success. It's my guess that these neologisms will be obviated by further elision of the distinction between singular and plural in the third person -- i.e., the singular "they", which everybody already knows anyway. Nonetheless, a person might have valid reasons besides mere pretentiousness for preferring one of the "new" pronouns. Officialdom will find a way to cope with the changes, eventually, through sheer necessity, and most people will end up going along with that.
But anyway, it's all about (a) showing common courtesy towards the person being talked about, and (b) accepting inevitable, occasional honest mistakes in good grace, correcting the offender politely and forgiving them. Repeatedly, deliberately using the wrong words to describe someone after being asked not to is a form of aggression.