People think of the kinds of income that makes the same money as doctors, lawyers, etc as upper middle, and the kind of people who can afford 10k sqft mansions, private jets and lambos as upper class, even if the numbers shake out to something else.

Not really in the US either, e.g. Pew research cutoff is 145k for family of 3.

You can handwave around the 150k end, but he 300k end is laughable.