The same argument goes for women in science. Albert Einstein was told he wouldn't amount to much. Doesn't mean he 'got discouraged' and quit physics. That's not why we do science - for public appreciation - we do it because we love it no matter what anyone else says. This is the point that the girls in tech people miss I think.
Instead of buying your daughters lego sets with women wearing fancy lab coats and looking into telescopes, buy them gyroscopes, or electronics kits, or lego's own DIY robot? None of the toys mentioned above feature gender and actually give a sense of what science is about.
I'm open to hear your thoughts, especially from women.