Not my experience. My family isn’t upper class in the traditional sense, no inherited titles or stately homes. But not middle class by mumsnet definition either. I suppose upper middle class maybe.
Maybe it’s because my main life experiences have been rural, and as long as I can remember a mix of everyone from the poorest labourers to aristocrats. The attitude was never about making assumptions based on social status or wealth.
My friends come from a wide range of backgrounds and have lifestyles across a similarly broad range, which to me is completely normal. I dare say I wouldn’t have much in common with the average benefits Britain tv star. But the same applies to many people claiming to be middle class. Wealth and career don’t define personality.
As for life experience, I think at least one, if not both parties would have very limited interests and experiences if you can’t find common ground. Discussing wealth and spending is vulgar anyway, unless it’s part of a relevant discussion with someone of similar means.
The only group I’ve ever struggled with as a whole are the pretentious try hard mc wannabes. I don’t like the falseness, and despise the sneering towards the less well off. Although I am amused by some of the desperate attempts to ‘prove’ themselves. And if they inadvertently notice my background is more entrenched than just my accent, either the arse licking or inverse snobbery that follows.
I wouldn’t be remotely bothered by the implied wealth of hiring a sleep consultant but I would have thought ‘fuck me, wasting the cost of a decent saddle’. Which demonstrates the difference wouldn’t be about income but about different outlooks.