It's fungible for you, since apparently few dimensions of housing are salient to you. In my experience, this is not the case for most people. Units on the same floor can differ vastly; buildings on the same block can differ vastly; the neighbors you have, the direction a unit faces, square footage, street noise are all examples of factors that matter to many people and which can vary dramatically on a geographic scale measured in feet. Many people don't consider housing fungible to the extent that produce is.

And I bet those apartments and homes carry roughly the same value/sqft...

The claim that housing is fungible is absolute non-sense, though.

If it were, we wouldn't see such drastic market variations, even within relatively close geographic markets (in some cases, literally blocks away)

We also wouldn't see such an intense pressure on evaluating real estate before purchasing (because if it was fungible - it's all the same, right?).

I basically don't know where to go in the conversation if you can't actually acknowledge the argument in front of you, and just say "No".