Wanted to emphasize this. Hope you don't mind the edit.
1. "Hackers don't give a fuck about women" is a more shocking statement than "Hackers don't give a fuck about gender" given millennial social justice sensibilities. That shock was intended, because it demonstrates to readers who aren't hackers the difference between their view and the hacker view, in a very visceral way. When you read, "Hackers don't give a fuck about gender", you have to think about it to realize how fundamental a difference in thinking that is. But when you say, "Hackers don't give a fuck about women", you can feel how different it is.
2. Gender is also a much larger issue than women in STEM. In the context of this discussion, "Hackers don't give a fuck about gender" is true, but in a larger context, I think hackers do care about gender, because gender is very hackable.
In person, I would totally say "hackers don't give a fuck about women" because like you said, it's got a rhetorical good punch, and I can also clarify it if misconstrued. Whereas on the internet, when someone misinterprets, I may, or may not, have to spend another 5 minutes writing a response.
Solid points.