To get frustrated being referred to as a girl?

[achingabs]

I am in my 40's working a professional job, I started with a new company this year. Speaking to my DM who is 70, she keeps referring to me as a girl. For context, it's male dominated office apart from me. About once a week one of us brings in either biscuits/cake / breakfast/ lunch either bought from the shop or baked at home. I took something I baked in. I told my mother she explained with great glee all the aged old adage of 'the way to a man heart' (all men are married I am the only single person in the office) and then she was saying they must think 'what a nice girl I am'.
I explained this was patronising and again this week she referred to me at work as a 'clever girl' and how the men must appreciate having a 'clever girl' in the office.

She keeps saying how she doesn't understand this political correct things she should say. I have nicely explained I find it patronising and demeaning.

I am no long going to discuss my work with her. But am I being unreasonable in getting frustrated?

I’m 48 and me and my friends often refer to ourselves as girls, as in a girls night out or girls weekend away. So what. Does it imply we are undermining ourselves? Does it hell, we are all strong and intelligent enough to know that a word for a group of females of any age has no bearing on complacency.

There is something more than black and white here, though, isn't there? As some PP have referred to, it's nuanced:

I'm happy to go on a girls' night out with my girlfriends

But at work, I am the woman who runs marketing, not girl.

Which is food for thought: maybe I need to stop calling my friends and me "girls". Sorted.