Not all junior high girls are going to be interested in Kathleen Hanna or read Rookie, let alone begin to understand what feminism is. Not all of them are even going to sit through the Chimamanda Ngozi Adichie spoken-word intro to Beyoncé’s “Flawless.” But if they listen to Top 40 radio, they will hear “All About That Bass,” which will soon dethrone Taylor Swift’s “Shake It Off” as the Hot 100’s reigning champ. If one young girl musters confidence because of Meghan Trainor, I can’t — for the sake of my younger self — despise her outright.