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It is rather in the vein of using an expensive lightweight aero bike to only ever play/ride Zwift on a phone... Upgrading the wheels might change how you feel about the machine but an actual (and significantly cheaper) improvement to your experience would be to use a bigger screen.
Never mind that in the proper environment (ie outside) weight and aerodynamics are quantifiable and the result (time over distance) is measurable and comparable.
You could say the same thing about people spending thousands on bikes, when none of that make a 'quantifiable difference'.
I'd rather rip him for his love of Thunderbirds and obvious union jack rug.