Unfortunately, to have free speech we have to tolerate speech that makes us wanna do...ooh terrible things to people.

Racist speech is protected speech. And a legitimate means of expressing your ideas. Long as it doesn't break site-rules I'd imagine they're gonna say put such users on ignore.
As somoene fairly well aquainted with unpleasant speech from others I may occasionally put such people on ignore, report rule infractions, and stick pins in the little voodoo dolls of them I make (kidding, but only just,) I nonetheless defend their right to say stupid uninformed things. And wouldn't dream of restricting it long as it isn't breaking site-rules we all abide by.
Can't let stupid hateful people bring ya down. First, there's more of them than there are us. Second, I think many of them are just so profoundly lonely they'll say anything no matter how outrageous just for some attention not having the mind to express a legitimate thought that'd garner as much.
But as Dr. King said best,
"Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars. Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that. Hate multiplies hate, violence multiplies violence, and toughness multiplies toughness in a descending spiral of destruction."