Biden wore mask while signing executive orders in Oval Office.

he's the president now

his behavior/example matters

So people couldn't see him mumbling to himself.

those are the fanciest, most expensive coloring books ever known to civilization sitting on that desk.

He is old and he probably is trying to set an example. Of all the things to dislike him for, this isn't very high on my list.

He's too senile to know when he's wearing it or not.