What we are seeing here brings to light an inconvenient truth: you simply cannot legislate away obnoxious social behavior. As long as I remember, Craigslist has prohibited discriminatory advertising to ensure listings comply with the fair housing act. Does this really stop a prejudiced landlord? When it gets down to the level of individuals dealing consensually with individuals, there isn't much that the state can do (unless it's a tyrannical state).

Black comedians have always joked about being passed over by cabs, well before Uber, Lyft etc. In the long run, I think these services actually improve things .. On the curb, all a racist cab driver sees is how someone looks .. but now everyone can develop a reputation that goes well beyond appearances. In addition, by taking care of payment, prejudiced drivers don't have to worry that some groups are less likely to pay at the end of the ride. Eventually, they will realize that the color of one's skin is a terrible predictor of character and (hopefully) become less racist.

So, the "sharing economy" is not itself racist, but due to its peer to peer nature it exposes the lingering prejudices in our Society. But, since prejudice requires a lack of reason or evidence, the sharing economy also provides a way forward. Through AirBnB, for example, we can not only see what someone looks like, but we get information about the content of their character. Granted, it's not perfect (nothing ever will be), but it's a start.