It goes both ways. I remember a conversation I had with a very nice Uber driver, a Muslim woman. She made a point of picking up female riders with low ratings, because she believed male Uber drivers would downrate them if they thought the women unattractive, or if they rejected advances.

Also an effective strategy to get uncontested rides, I assume.

Of course, occasionally you’re going to get low rated passengers who are just straight up assholes. So there’s some risk.