And the thing is, it really doesn't cost much to anyone to have to wear a mask if you can - with exemptions for those that need it.
It's a small sign of respect and value for teachers and the wider community. Which this country seems to lack.
I know a child (aged 6, but started when he was 5) in the USA who's worn a mask in his classroom since Sept and is happy to do so because he knows it's part of being kind and community spirited and it's something everyone is doing to protect the most vulnerable from harm. He is PROUD of his contribution, he feels like he's doing something really positive to help beat covid (and his state has done so much better at preventing death than we have). And he's had no problems with it at all.
There are kids in his class with exemptions, of course and everyone understands that.
I think one of the longer term harms of this pandemic is that state school kids in this country have seen how little the government and wider society care about their education or their teachers (most kids care about their teachers and don't want them to get ill).
Cases are low now and - if we're not too impatient - we are close to the end of this. Masks for a little while longer seems a small price to pay.