Saying he doesn’t care about racism towards white people makes him at least as racist as me, the standard I’m gonna use to judge him. Now, I think I’m not particularly racist, and if I am it’s unintentional and if it actually caused a problem I’d deal with it. But that, to Dibble, makes me almost Hitler. So he needs to accept he’s exactly the same.
Basically, if you’re actually concerned about racism, you should be concerned about all of it, and support measures towards equality that will make things better for all sufferers, whatever their race. Because if a white person has their life ruined by racism - even if it’s only one person in the whole country - they’re just as fucked as any black or brown person who the same thing happens to. And the same solutions should work for both instances - treat people as you find them, regardless of skin colour or racial identification.