So if teenaged girls are not affected by sexist attitudes in the tech sector when they choose their educational path, then there is little holding them back from getting engineering, computer degrees, etc. Their enrollment rates at university would be much closer to that of men's. There simply aren't the scores of female engineers you claim there are choosing to discard their education in the face of male sexism. You can't answer why teenaged girls generally prefer social sciences and arts in favor of STEM fields. Your only answer is unfelt future possible male sexism, which effectively ignores the several hundred thousand years of human evolution behind our motivations.

And yes, a female garbage truck driver would be just as efficient as a male, but I suspect you spend exponentially less engery advocating equality for these unglamorous professions as you do for STEM.
Why male sexism is so bad in the tech sector, but not other recently male dominated ones like law or medicine?