He cant be serious?

[Wainuiguy]

My grandchildren in the USA were used to wearing masks when out of the house when Covid broke out. They were 3 and 6 at the time.
Their parents reinforced it, explained to them in words they could understand why it was necessary.
Never had any issues. It was approached the same way as seat belts - "No mask, no outing".
I suspect whether or not there are tantrums depends on the way the child in question is used to getting his/her own way, unless of course they have psychological or physical issues which make wearing a mask difficult

Wow, just wow.  The worst case of helicopter patenting I have ever heard of.