[User23]

It would be interesting to use the Uber/Lyft dataset of driver and passenger ratings to do an analysis like this.

For any such analysis there are a great many confounds, both blatant and subtle. Finding racism everywhere could be because overt racism is everywhere, or it could be confirmation bias. It could even be both! That's the tricky thing about confirmation bias—one never knows when one is experiencing it, at least not at the time.