[Kronopath]

Legally, it’s not compulsory. Socially and culturally, it definitely is. In the US, if you don’t tip 15%, you’re either an asshole, or you’re saying there’s severe issues with the service.

I’m not going justify this culture—I don’t like it either—but that is the way it is.

[relativ575]

I'm in the US and a frequent Uber users, and I've only tipped once over 10 years. My rating is 4.93, so I don't think the drivers see me as an asshole.

[bossyTeacher]

It is possible there exists a table called dbo.user_ratings with a boolean column called IsAsshole, and you might have tons of rows there all with a 1 on the boolean column but the Uber APIs don't return that value. CEO Travis could tell us if it exists

[noitpmeder]

It's doubtful drivers are able to see whether or not a rider tipped before they are prompted to rate them.

[huytersd]

No one using an Uber tips.