I googled for a simpler test of the relationship between gendered language and sexism.
Here are the top 20 least sexist countries in the world
20. Canada 19. United States 18. Latvia 17. Netherlands 16. Sri Lanka 15. United Kingdom 14. Belgium 13. Germany 12. South Africa 11. Spain 10. Switzerland 9. Philippines 8. Lesotho 7. Denmark 6. Ireland 5. New Zealand 4. Sweden 3. Finland 2. Norway 1. Iceland
And here's a partial list of genderless languages:
Estonian, Finnish, Hungarian, Persian, Basque, Chinese, Japanese, Korean, Malay, Quechuan, Tagalog, Dravidian languages, TurkishOnly the Finns make both lists. They're great, but the evidence suggests it's not because of their genderless language.
So if I re-embrace the generic "he", you know why.
PS. The Tagalog peoples are a third of the Philippines, so you could argue that language is a factor there, but they're still outnumbered by people speaking gendered languages.