Which is nonsense, because the Alliance races never show any issues working with one another whilst there's always some sort of animosity within the Horde: nobody trusts the Forsaken, none of them like the Goblins, the leaders usually have issues with one another. Hell, which faction had a civil war because they started killing one another?
I don't get this "the Alliance racist!" meme when within WoW's timeframe we've been shown absolutely nothing to support it.