I'd like to think an Uber driver who did would be dropped by the company, but given what this article says I'm beginning to wonder. I recall reading a while back[1] that driver ratings were so important that some drivers were canned after just a few mediocre reports and forced to undergo training that they had to pay for themselves. I can't imagine a driver who discriminates getting a good review, and if it becomes a pattern they should be suspended based on Uber's own policies. But it sounds like Uber is circling the wagons here.

[1] http://observer.com/2015/02/uber-drivers-the-punishment-for-...