Still, passengers shouldn't be too freaked out by the possibility of getting called out by your driver. After all, the idea here is to minimize real life interaction, and rehash any potential issues after they've already transpired. Plus, only riders who receive the same tag more than three times in a 30-day period will be notified of their antics in the form of a notification in the app.
But then again, if you fall afoul of common decency that often, you shouldn't be surprised when you find yourself with a low rating. After all, you've probably been told why it's so bad in the first place.