Using 'big' words.
I kid you not. I was 23, I was at a training course for a public service job that I ended up staying in for 10 years. And during a table discussion about the first week of the course and how we were all feeling about it etc. One of the other women (who was the same age as me I expect, maybe a year or two older, and ended up in the job for about as long as me too) said to me: "Oi posh bird, can you stop using such big words, I can't understand anything you say."
Said with a 'mean girl' sneer. I was flabbergasted and had no idea how to respond! I would respond pretty bloody loudly nowadays... but that is certainly the weirdest and most 'trivial' thing I've been told was wrong with me.
I don't/never did use particularly high brow language by the way, but I DO have a very middle class/middle England accent, that I'm afraid I just can't shake, despite being a Norfolk resident for a good number of years now 🤣 I had just been working in a rather well to do university, and I expect the environment had rubbed off on my language and accent somewhat. But never in my life have I had someone tell me they couldn't understand the words I was using before (and particularly that that was my fault!), not before and not since!
My response was a little immature, but I was embarrassed, and felt rather bullied as she was laughing and others were too. So I responded that "It's not my fault if you can't understand me, try reading a dictionary."
🤷♀️🤷♀️🤷♀️ Like I said, a little immature. But it stopped her in her tracks, and she didn't pick on me again!
She runs her own business now, working with far far 'posher' people than me. And I often wonder if she tells them to speak differently, or that she can't understand them! I rather think not...