A/B testing the gnupg developers. Submitting patches as female and male pseudonyms
Tweet related to this paper: Gender differences and bias in open source: Pull request acceptance of women versus men
A tweet with no substantial (and possibly scientific) evidence other than a not-yet-reviewed paper. I would be cautious before jumping to conclusions and start another civil war inside the free software movement.
Remember how correlation does not imply causation.
For what it’s worth, I personally have my fair share of experiences with sexism involving GNU. I also don’t have nearly as many such experiences in the rest of the Free Software world.