“You don’t know what it’s like to be a woman,” an older woman snapped at me during a heated debate last month. “The elephant in the room is people aren’t voting for Hillary because they are sexist. Women can be sexist, too.”

I was incredulous. I know what it’s like to be a woman because I am a woman.

But as a young feminist talking to an older feminist, our interaction was a microcosm of broader trends in the United States. In the Democratic presidential race, a recent poll suggested that Vermont Sen. Bernie Sanders held a commanding lead over former secretary of state Hillary Clinton among millennial women.

Last month, feminist icon Gloria Steinem said young women are supporting Sanders because “the boys are with Bernie.” Meanwhile, former secretary of state Madeleine Albright proclaimed at a Clinton rally, “There's a special place in hell for women who don’t help each other!”

It’s a divide that has left older women scratching their heads: Why are millennial women rallying around the old white guy?