I don't think that hair can be effectively split. By your logic there's all sorts of obviously anti-black stuff he can do on the nominal grounds of message. Refuse to make a cake bearing a name he sees as black. Refuse to make a cake celebrating the birthday of a black person.

Similarly, a print shop could by that theory refuse to reproduce the resume of a black person on the grounds that they think black employment is against their religion. There's extensive (white) theological history supporting that position.

Of course, exactly none of this is the same thing as YouTube deciding not to run ads on some corporation's videos.