The idea that that women are more into people than men, who are more into things is much more well established. With large cross-cultural studies and meta-analysis showing one the largest effect sizes in social science.

Gender Differences in Personality and Interests: When, Where, and Why? http://sci-hub.cc/10.1111/j.1751-9004.2010.00320.x

Gendered Occupational Interests: Prenatal Androgen Effects on Psychological Orientation to Things Versus People https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166361/

But the % of women in CS doesn't seem to correlate very highly with my intuition about sexism. For instance I would never think that Mexico or Poland was a far less sexist place than Norway. Nor does it seem to correlate well with female student's math anxiety. Mexico and the U.S. seem to be very similar in terms of the math anxiety gap, but very far apart in term of number of female CS majors.

You could look at the charts and see support for the hypothesis that "there is variability in the % of women in CS therefore the difference is cultural" but you could also look at it and say "look across every cultural in the world women choose CS less often than men".

We also don't know why, it could be gender stereotypes about what field women go into, or it could be emphasis on passion vs income. With countries that place greater emphasis on community and income having larger numbers of women in CS, with countries that place greater emphasis on passion and interests having a lower number of women in CS.