Wait, what are you basing this generalization on? If it's purely based on numbers, I've worked with more female programmers than african americans. If the allegation is that the software industry is sexist purely because women don't participate, then the software industry must be even more racist.
Umm...assuming no bias, institutional or otherwise, you should randomly encounter a woman programmer once for every male programmer. Whereas you'd only encounter an African American one out of eight programmers (12% of the total pop).
Some certainly are. It's important for us to have diversity in a variety of areas (and intersections of areas), not just women. That being said, this specific article is focused on a woman's experience, so it makes sense that it would focus on gender.
Low afro-american/hispanic participation can be explained in large part by lack of high quality education, lack of computers, etc. There is some residual, but nothing like the vast disparity that exists for women despite a lack of acceptable reasons.
