Schools Policing Gender

Two recent US items of interest in this context.  First, a boy with a My Little Pony lunch sack was told by the school not to bring it in because the lunch sack (coded for girls in this culture) was a "trigger" for bullies. 

Second, a Christian school told the grandparents of an eight-year-old girl that she looked (and acted?) too much like a boy.

These gender-policing examples may no longer be extremely common in the wider American society (though I have witnessed parents doing this quite a bit, by replacing the toy a child holds with a different toy etc.)  But the camp believing in mostly innate sex differences should make a note that cultural forcing does take place and that gender roles are being policed, even by the children themselves.