Mehitabel can't you see your posts about this give off a strong sense that you think calling yourself Ms and insisting on it is a bit looney and letting anyone get away with it is political correctness gorn mad.
Of course no one has to "put up with" being called Miss if they want to be called Mrs. Tell the kids. Write it on the board, inform them why and what it means and drum into them the importance of respecting a person's title preference. Tell them you'll pay attention to their requests when addressed by your correct title, and so on. Any "Mrs" could insist, just as much as any Ms, if she wanted to.
And I do totally respect people's choices and call them by their preference. Because I respect people's feelings. However, I do also think that if you agree to a system that is unfair and treats women differently to men and as if they only exist in relation to men, you are broadcasting to the world (and all the kids you teach, sadly) that as a woman you think that's OK - that deep down you don't think you deserve the same rights and freedoms as men.
I realise you may not see it that way, but I do and I have objective fact on my side. It's true that sexism exists, women are disadvantaged in countless ways, and suffer poor treatment from men (and other women) in a gendered way. And it's also true that when it comes to naming conventions, that inequality is reflected. Titles that serve to reflect a woman's relationship to a man, and name-changing that reflects women being less important than men, serve to reinforce and perpetuate that unequal message.
So, IMO, any woman who adheres to those traditions is helping to do other women and girls, all of them, as well as herself, a disservice.
I can think that, and still respect that my newly married friend wants to be called Mrs Hisname. To me, she might as well call herself "Hisname's Chattel" but I would never haul her over the coals and tell her she should do things differently. If the subject comes up and is being debated though, as here, I'll say what I think.