[…] boys will be aborted and neglected in favour of girls

It’s the first time I hear about this. Any relevant links you could share that corroborate this take?

This article is not really about mathematical talent. It mentions that stereotypes might be reproduced by attributing success in girls to diligence and in boys to talent, but it’s about mathematical ability.

At the start of the first school year (when children are five or six years old), there are no differences, on average, between boys and girls in mathematical ability. But after just four months, boys have pulled ahead. The gap widens throughout the year.