At NanaMacGeek - this is a good thread for several reasons but not for learning how to comment as several of the dissenting comments have been needlessly 'snarky' towards those of who (quite rightly, but that's just my opinion) find the thought of 'byom' (bring your own mug) appalling as regards public health. I'm glad you started it - at the least it's reminded me poor 'Nettique' exists even among those of us old enough to know better, but especially as it has brought up for discussion a quite important topic.
Here's why - 'herd immunity' happens when people exist in a community population that remains relatively unchanged, no large scale arrival of incomers with virus/bacterias previously unknown to the original herd to throw a viral/bacterial spanner in the works. When we were growing up most of us lived our entire lives with very little exposure to varied illnesses as we rarely travelled outside our local areas except (for the lucky ones) on holidays to different parts of Britain or abroad where we would encounter 'new' virus/bacteria. Herd immunity also occurs when ALL children in a school or group setting have the same vaccinations or prior illness.
Herd immunity, therefore, works great when the herd is reasonably stable but breaks down horribly when the herd is no longer stable. We here in Britain are no longer citizens of a stable herd population - we are now an extremely unstable herd given the sheer numbers of incomers to our towns and even country, and those incomers, however welcome, bring with them 'new-to-us' virus/bacteria. We do need to be aware, more now than ever, of good hygiene and sanitary conditions in public places. We've lost our traditional herd immunity, adults and children alike, owing to our more travelled and more immigrated-to lives, and must factor that consideration in given the strain our NHS is under.
What we don't need, any of us, are the outright derisive comments when those concerns are brought up for discussion. I'm new to Gransnet but am re-considering this as a good place to talk and network with other grandparents. But that re-consideration is a 'side-bar' thing compared to the importance of this issue. I'm adverse to wanton abuse of our planet, and there are ways to eliminate or mitigate the impact we have but taking risks with public health is not one of the ways.
And again, neither is being needlessly rude to those with whom we disagree. I think you deserve an apology for some of the comments made to disagree with your OP, but were rude, derisive, and frankly openly unkind.