One of the linguistic tics that has remained with me, as someone from a basically working-class background is the addition of a self-deprecating adjective like “poncey” or “yuppie” to anything vaguely middle class. Despite having lived a basically middle-class lifestyle since going off to university as a teenager, I still feel the need to describe anything containing quinoa as “my poncey salad” and similar remarks.
I think this started at university. A colleague started referring to filter coffee as “bourgeois coffee” and the name has stuck, at least in the back of my mind, ever since. Similarly, another light-hearted fellow student’s description of the mineral-water-with-lemon that I used to get sometimes from the local shop as “your yuppie water” remains to this day. There is still, in the back of my mind, the idea that Real Men drink instant coffee and tap water, and that fripperies like cafetieres are odd inconsistencies.
I think this a reliable tell for people who have moved from a broadly working-class background to a middle-class one.