I also see elementary (majority female) school teachers actively encouraging boys not girls to the point where it makes me sick. More so given the amount of women that act as though women doing worse/having less confidence in Maths in part of some sinister male conspiracy.

I am putting my money on something (Oedipal) that makes the female elementary teachers treat the girls differently which a lot of girls see as disproval for being good at Maths and once this is internalized it is hard to turn around.
Become what you are