I don't object to anyone elderly or with health needs shopping with another person for support.
I don't object to those with health issues ditto.
I don't judge one parent with DCs, they may have another adult at home but they may well not. I don't know.
I do object to a group of three adults, two teenagers and two more DCs aged 7/8/9 - with only the adults, if any, wearing masks.
I object to a group of six young men going in together, no masks, and each buying a pack of beer cans.
Or a group of teenage girls mooching round the makeup together, also no masks.
I object to a smaller group of two women and two DCs between them, aged around 9/10, no masks on the DCs, when it was clear from their (loud) conversation that this was exactly a 'day out'. (They were looking at soft furnishings in Morrisons.)
If security have the power to question and eject the latter groups, I'm all for it.