> The writer seems to imply that online dating uniquely has this problem. On the contrary: IRL, ...

Not sure why you draw this conclusion? The OKCupid blog (as well as the linked article) are both clear in that this data on an online dating platform simply documents/mirrors a societal trend (and inclinations) already existing.

It is not a commentary on online dating or technologies, but the state of society and the role race continues to play.