As long as racism exists, then it's relevant. And when you're reporting the news, that's one point that, if left out, could brew a huge firestorm.
No matter his color, the ref shouldn't have engaged in the back and forth, but I guarantee that had the ref been white, it would've made an ugly situation even uglier.
Not going to take this discussion any further, because of Zone rules and all. But that's just how I see it and why I think it was a good thing to include that particular point, no matter how odd, in the article.