I think, Black, that if you get the wrong day, you could find yourself in that situation in almost any supermarket. I nipped to Tesco this morning - screaming kids chasing around all over the place, mouthy mothers screaming at said screaming kids and (most amusing) two mouthy dads arguing over a discounted Lamb Rogan Josh that was in the short-date fridge.
On the other hand, go early on a school day, before the mothers and the old biddies get in there and it can be a most serene experience.
It's not about who actually shops where, but more about how they behave when they're doing so. I remember once, after sighing very audibly at a child who'd slammed himself himself into my trolley for the fourth time that morning, his mother giving me a filthy look and saying, "whassup, ain't yer ever 'ad no kids?"