My partner just got back from popping to the shop for fun food (we all need chocolate and snacks to keep us happy at the moment!) – the cashier said: “That’s not really an essential shop, is it?”
If you get this response from anyone at all, just remember to answer: “If the shop sells it, it’s essential, and I can buy it.”
(And perhaps tell them to keep their nose out of your basket, too!).