All I said is that class based pricing exists in the US, but it works via physical separation rather than directly based on how the customer looks.

That physical separation is maintained by the actual physical class separation along policed municipal boundaries that exists in the US.

Developing societies instead use walls with barbed wire and hired security for that function.

That said, there are pretty strong correlations between the tier of the grocery store and the appearance of their average customer.

And yes, there are wealthier but frugal people who shop at cheaper stores, but they are an exception.