That's a well stated argument, and it's definitely true that you can't look at the tech industry in a vacuum. But I think it would be very difficult to argue both that US/Western/California society is sexist in a way that prevents women from entering the field, and also that all the men that entered the field have magically freed themselves from the sexist cultural biases and attitudes of the larger society they grew up in.
Also, in this scenario, even if the tech industry is not actively sexist, it is being affected by the sexism of the wider society - and, if you think there is anything wrong with that (eg decreased pool of potential employees/founders/idea people), then it is quite possible to make tech-industry-specific moves that counter the extra disadvantages imposed from outside the industry, like affirmative action programs for girls that give them increased access to the tools that will allow them to forge their merit, even when you can't quite identify the process that is reducing their access in the first place. In fact I think that for a field which prides itself on solving big problems, saying 'it's not us it's the rest of society' is a cop-out, and to agree with your statement and not support affirmative action in some form is equivalent to supporting entrenched sexism.
There is a huge difference between saying "tech industry, you are so innovative, why don't you look at this problem and see if there is something you can do to fix it" and saying "tech industry, you are racist, sexist, misogynist, and you should be ashamed of yourselves". I am all for the tech industry finding solutions to hard problems, and I am all against the tech industry being blamed for something it did not cause.
Yes, and 'tech industry, you are so sexist and should be ashamed of yourselves' is a reasonable response to people saying 'Lack of women in tech is clearly a sign that women don't want to be in tech/aren't suited to it because anyone can enter tech and pitch a VC if they want', or 'Affirmative action will just mean there are incompetent females getting ahead at the expense of more competent males' (see the complaints about the Etsy scholarships, for instance: usually comes with complete denial of any systemic disadvantages).
I guess in these cases they are being blamed for not seeing the problem and so perpetuating it, rather than for causing it. But at some point it seems reasonable to say that ignoring or denying the existence of something so well-studied is wilful rejection that makes you part of the problem. How about the phrasing 'tech industry, you are perpetuating sexism/racism even if you don't intend to and you should be ashamed of yourselves'?
is a reasonable response to people saying 'Lack of women in tech is clearly a sign that women don't want to be in tech/aren't suited to it because anyone can enter tech and pitch a VC if they want'
Is there any argument against your views for which an ad-hominem attack would not be a reasonable counterargument?
Also, in this scenario, even if the tech industry is not actively sexist, it is being affected by the sexism of the wider society - and, if you think there is anything wrong with that (eg decreased pool of potential employees/founders/idea people), then it is quite possible to make tech-industry-specific moves that counter the extra disadvantages imposed from outside the industry, like affirmative action programs for girls that give them increased access to the tools that will allow them to forge their merit, even when you can't quite identify the process that is reducing their access in the first place. In fact I think that for a field which prides itself on solving big problems, saying 'it's not us it's the rest of society' is a cop-out, and to agree with your statement and not support affirmative action in some form is equivalent to supporting entrenched sexism.