Just read books, any books, from (auto)biographies and interviews with old people to fiction, before 1970, and focus on men-women-relationships. Feminists will find it easy to see sexism everywhere, but it is just as easy to find points that falsify the feminist narrative, sometimes even more crushing than you’d expect. And I can tell you, it’s a very interesting way to read books! (I f ex just read Agatha Christie’s autobiography. It’s of course very specific and rather upper class, but still quite enlightening. She loved being a woman all her life and resented egalitarian ideas.)