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Inflation necessarily means losses for everyone.This is the thing you're disagreeing with parent on, because it's not true if you can afford to hold the assets that are inflating.
Inflation doesn't happen in a vacuum: it's inflation-in-terms-of-____.
If you happen to own a lot of ____, because you have disposable income and can afford to invest, then your net worth "inflates" too.
Simple example: how does inflation of the price of gasoline at the pump impact you, if you own a refinery and a filling station? Certainly not in the same way it does to someone who owns neither and commutes to work daily in an ICE vehicle.