OP, I empathise.
My mum weirdly did the opposite.
My mum lives in a 'nice middle class area'. My parents deliberately moved there when I was a child so that I could go to good schools in an area with low crime, and clean, safe streets. Its an area a lot of people locally aspire to live in.
She was an intolerable snob for the better part of my life, quite frankly.
And then, out of nowhere, she started referring to the area she lived in as 'the estate'. It wasn't an estate of any description. It never had been. But she insisted on calling it so and argued that it was.
She also started referring to the 'factory fortnight' a lot. Now, I'd never heard of the factory fortnight but she started insisting we'd always known about it and had to go on holiday during the factory fortnight. We just didn't. We went on holiday during school holidays and away for weekends when my parents wanted to and neither of my parents worked in factories. But she insisted it had always been part of our lives and we just didn't remember - silly us.
She also started talking about 'the social' and her life on benefits despite the fact that neither of my parents had ever claimed benefits or had any involvement with 'the social (social services, I think). It was utterly bizarre.
But she would argue she had been 'on benefits' because she'd claimed Child Benefit and would be getting a state pension and that we had had involvement with 'the social' because my elderly grandparent had a care assessment when she developed Alzheimers and needed Home Help.
When I had my first child, she was absolutely insistent that I needed a social worker based on nothing other than this weird shift in viewpoint that everyone did. Or everyone we knew. No one we knew had social services involvement except the couple who adopted.
She had spent my entire childhood making sure people thought we were 'middle class' and then decided that there was some romance in being working class or living on benefits and with social services involvement whilst living on a council estate when we just didn't.
And i apologise for anyone who is offended by the conflation and assumptions of people who are working class, on benefits, have social services involvement etc. It's why it was so fucking ridiculous and pissed me off so much.
It's easy for people to say, "Why are you bothered?" But it's ridiculous and infuriating when you have to entertain it.