It should be a condition in the DSM-V.
I know from family who live where Taylor Swift bought a mansion in RI that she was denied membership to the local yacht club because she was not "old money". I heard this back in 2013 when she first bought the place and I haven't been back so I don't know if that has changed since then.
Maybe some people see the rich as "high-class" not everyone does.
There are people who literally think there are only two universities worth being at: Cambridge and Oxford. They are shocked when they find candidates from abroad turning down offers for permanent positions there or leaving their positions for somewhere else.
Even within Europe, there are many institutes that are strictly better than oxbridge. If you’re a scientist, there is no point in being too narrow and confining yourself to UK.
I would agree though that at the undergraduate level oxbridge is excellent. Postgraduate what matters actually is the advisor and grant money.
It works the other way also......... plenty members of our upper class aristocracy are penniless, but are, and remain, upper class.
I always find the US approach to equating money with class rather amusing.
Unlike other countries where class is mostly defined by money, the UK tends to define it in the old school heritage and upbringing sense of the word. No matter if you made millions, unless you have pedigree, you don't belong. Makes me chuckle a bit when people complains about classism in the US.