The thing that troubles me most is the use of her son holding that sign. The poor child is just a pawn in a propaganda game. I don't approve of people putting pics of their younger children on social media before they're old enough to give permission but this is particularly nasty.
Four-year olds don't need to know about periods. And they certainly don't need to be confused by lies about boys having them. He's going to find biology lessons at school hard going.