It is so refreshing to see something of a sociological perspective on this debate.
I think that her premise is sound, but her conclusion is wrong. Many women do feel uncomfortable in many of the situations she outlined. Feeling uncomfortable about your pregnancy _is_ about feeling uncomfortable about being a woman in your field or your office. And it might feel ridiculous, because feeling uncomfortable about your gender in a "post-feminist" workplace doesn't really make sense, does it?
Except a lot of women feel this way, and it cannot be directly attributed to them. It's poignant to say that women themselves are partly to blame, because peoples' lack of action can often perpetuate the culture that causes those feelings
However, the main culprit IS the society itself, not individual women. It's not a particular persons' fault for feeling a certain way, and it's certainly not an entire group's fault for sharing a feeling of discomfort.
When hundreds of thousands of women who work in tech feel the same way, that's not a sign that they all need to realize that their insecurity is 'imagined'. It's a sign that something about their environment is making them feel that way.
Feeling uncomfortable about being a woman in technology is a symptom of a male-oriented culture, not a cause. To say otherwise is to perpetuate the culture that makes women uncomfortable in the first place!
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RE: comments about a woman using a sexual favor to get to her position:
Comments like this are not harmful because they affect a single employee (although they are disrespectful, disgusting, and rude). They are harmful because they use language and concepts that objectify and derogate women. When someone uses this language (or calls a full-grown woman a 'girl', or comments on a woman's physical attractiveness in a professional setting, etc), and is not reprimanded, it perpetuates a culture that trivializes and invalidates womens' professional accomplishments, praises and characterizes them for physical or sexual qualities rather than professional ones, and makes it that much more OK for someone to make a similar statement in the future.
This kind of culture is what makes women have second thoughts about showing their pregnancy. Not an individual delusion or dramatization.
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Yes, feminism is about egalitarianism, but that simply means that it is a movement that works towards that goal. In a society that is already sexist and already uses language like I mentioned above, active forces are needed to change the culture in such a way that will move towards that egalitarianism.
Every day, when you don't call someone out on gendered or sexist language, you assist in perpetuating a stand-still culture that believes gender equality has already arrived. It hasn't. There's still a lot of work to do, and most of it has to do with our language and every day behaviors.
TL;DR:
Feeling uncomfortable about being a woman in technology is a symptom of a male-oriented culture, not a cause, and the language we use every day defines that culture, so jokes about a woman using sexual favors to get a certain position are incredibly harmful to women as a whole.
EDIT: just realized this comment is pretty badly placed. However, I think a society-level discussion of these issues is badly needed, and the parent comment serves as an excellent segue.