The video, shot in a bathroom at the Marriott Marquis in Atlanta, shows what appears to be a very discriminating infrared soap dispenser.
To illustrate, the filmer waves his hand under the sink saying "Watch, black hand," and the dispenser doesn't work. He then asks his white friend, Larry, to do the same, and the dispenser works.
And in case you thought it was just a coincidence, the two friends continue to alternate and consistently get the same results.