I wonder at what age we (or many, anyway), become so intolerant of changes in everyday language.
Personally, I don't really mind how I am addressed, yet when pressed to select a title, I am often tempted to opt for Ms, simply because it runs through my mind that my marital status is none of their business.
That's dispite the fact that I thought Ms very odd when it first started being used.
But I also found the word 'partner' odd too back in the eighties, and couldn't imagine myself ever saying it. Nowadays, I say it frequently, and would struggle to know what to use on many occasions if this word didn't exist.
OP, I think your neighbour was very rude, and however she personally feels about the title you used, I think the way in which she told you was both unnecessary and unacceptable.