That if you see a child in tesco on the floor screaming and head banging with his mum trying to get him into some sort of safe restraint while being bitten and nipped to please walk round, don't try and squeeze your trollie and small child through the smallest gap imaginable past them, please ignore it, don't make comments about naughtiness and tantrums, tut or shake your head.
Please just try to understand that it's hard enough watching your child have a total sensory overload and meltdown, harming himself without other people making it more stressful.
I know it's inconvenient and I'm very sorry to impose on your shopping trip, but sometimes I need to buy milk.