I don't think this is the case at all, this has been a trend since basically the start of all public schooling.

And on a tangent, as for "girls in STEM" programs, I'm not really sure why they need to exist. I think a "girls in STEM" program is as necessary as a "boys in teaching" program, and that is, not at all. Different genders will naturally gravitate towards different fields, and we don't need to fight that.