There is no proof to be a bias against non-male in the programming world. As far as I know, any country regardless of their gender equality effort up to a certain point have basically the same women to men ratio, which means it isn’t the action of some oppression or shaming. Worse, countries that are less egalitarian are a more equal ratio of women and men, like India, as opposed to a lot of western countries. It’ll never change unless you manage to brainwash a good amount of women into thinking they like programming, despite them not liking it.
F-Droid isn’t the only one: I also like Neo Store, which has more than just the F-Droid repository and I think has a better interface. However, I think not all repo are 100% safe because F-Droid verify all the apps they have while Neo-Store doesn’t because it simply list known repos, which you can activate however you like in the settings.