I know couples living in the San Francisco bay area who clear $175,000 combined income between the 2 of them, and I can tell you they are NOT upper class. The cost of living is so high and taxes are so high, they are comfortable but they are definitely not upper class. No fancy cars. No fancy vacations. They are not living large on $175,000 in the San Francisco bay area. Not even close.
For example, both of them are self employed, so they both pay the full Social Security amount for themselves rather than having an employer to pay half of it for each of them. Just one example. But mostly it is just such high home costs, transportation costs, food costs, parking, fees, local taxes, etc.