As part of my job, I had to attend a BBQ today, one where parents and children hung out and chatted with staff/faculty (I'm "faculty").
One woman, whose kid is in my class, was talking to me about Berkeley and calling me "Mrs. Bum" (I was wearing a name tag that clearly specified "Ms Bum"). After a few times of being called Mrs. Bum, I indicated my tag and said, "Not Mrs, just Ms".
The lady, very nicely, said, "Don't worry dear. There's still time".
I'm amused that "Ms." now seems to have the same connotations as "Miss" used to...or, perhaps, this is a one-off.