The assumption in the "weeded out" rhetoric is that girls are on their way into tech in equal numbers and diverted out by some experience or more nefarious dissuasion. This has not been sufficiently demonstrated and usually is presented without evidence.

It's unclear what people make of the fact that certain STEM disciplines, say Biology or other Life Sciences, have an over-representation of women. Curious why the "weeding" only occurs in certain STEM disciplines.