I find it very hard to believe that a woman may be 'conditioned' to reject STEM careers in favour of others. A parent of a daughter with an interest in STEM would not dissuade her from perusing it in this day and age. I believe women have agency, and will choose to go into STEM if they are passionate about it. I think we see less women going to STEM simply because less women are interested.
I have no problem encouraging women and girls to explore STEM, the same with encouraging men and boys. I strongly disagree with giving women an advantage over men in hiring, scholarships, etc. There should be equality of opportunity, but that should not ensure equality of outcome.
EDIT: Double posted, oops.
I don't have readings unfortunately (I don't do much reading on feminism, but I sure would take it over some of the stuff on electromagnetism I've got right now, lol) but I have seen quite a few people, statistically significant in the sample size that forms my friends and acquaintances, where women have experienced an influence that tends away from STEM, the corporate world, etc. In most cases it is from the parents. So I suppose to answer the question, yeah, I have seen women (subconsciously, and sometimes even directly) discouraged from entering the STEM fields by their parents, extended family or family culture
As to inequality in initial STEM education - I know for a fact there is underrepresentation. Statistics show it for higher education, but I don't need that - I just need to walk into my lecture theatre to see it. In my secondary education, there were no females in the graduating HSC Physics class, nor the graduating Extension Mathematics class. I
think only a single female Chemistry student out of nearly 20. In my Year 10 Mathematics class, probably a 5:1 Male Female Ratio. And I can't remember further back than that - But yeah, underrepresentation is (I believe) irrefutable.
Does this represent inequality in treatment? Well I think it is evidence of the fact. You don't have those sorts of figures if everyone is treated the same from day one. If you respond with the fact that women are less interested, then the question becomes why. If women and men are both treated completely equally from day one, why is it so lopsided?