Hate speech towards "Black children" or "female drivers" does not break the rules, while hate speech towards "white men" is. "Drivers" and "children" are not protected minority groups under Facebook rules, but both "white" and "men" are -- just like real life ... If this doesn't make sense, don't worry, because it's absolute bullshit anyway. There are loads of other rules that Facebook censors operate off, such as removing any posts that glorify "violence to resist occupation of an internationally recognized state," which has led to a ton of activists getting their content removed in places like Palestine, Crimea, Kashmir, and so on.
As you can probably tell, this leads to all kinds of gross censorship, like when comedian Marcia Belsky was suspended from the platform for a month for saying "men are scum." Or when Facebook "accidentally" suspended hundreds of Dakota pipeline protestors and issued a mea culpa that even Elmer Fudd would have a hard time buying. Or when Black Lives Activist Didi Delgado made a post about white privilege and racism, only to get her account banned for a week.
But, you might argue, at least Facebook also targets actual hate speech too, right? Not entirely. A while back, U.S. Rep. Clay Higgins wrote an entire anti-muslim hate rant on Facebook that largely went unpunished. Thanks, Zuckerberg.