First the cabs, now the webcams ignore black people!
Jokes aside, this is obviously a flaw in development and not intentional. After all, there is a reason for the words "black" and "white". They didn't test it enough on black people, or not at all, so thy didn't took into account the different colors and contrast and blah blah blah necessary to make this work.
I'm pretty sure that an star wars geek disguised as a green or blue alien wouldn't be tracked either because of the different color of his silly painted face.