Stop worrying about computer science specifically -- it's no different in engineering fields, and worse in the sciences. The reasons are not specific to CS.
I'm addressing CS because it's relevant to me. It's a community that I participate in so I'm addressing this issue in my community. Honestly though, the gap between women and men in CS is far greater than other fields.
You're replying to a reply about blacks' presence in these fields, not women's.
Yes you're correct, I honestly don't know what the achievement gap is for other science fields - so I don't know if it's worse in CS for people of color.
With CS it's a more concrete problem because both the Tools and the Results count as linguistic artifacts, and there is a clearer correlation with languages and linguistic praxis.