There's that.
I have noticed the identification of the Nord/Stormcloak cause with racism comes very easy to some (see all the "Stormcloak vs. imperial" threads). Such an impression would be less available if some racial roles had been reversed, I believe.
The "drunken Nord louts insult dark woman" incident, when you first enter Windhelm, is all too recoganizable and is almost irresistable in its forgone conclusions about the stormcloak cause. If that doesn't trigger the white guilt, the semi-apartheid system of Nords/dunmer in the city will.
As some posts higher indicate, the Nords are OK as long as they're just dumb, jovial drunks some with rough edges and a Santa-Claus laugh, as in earlier TES games. But rallied around a serious political cause akin to nationalism, they suddenly become a lot more threatening and also seem to make a lot of people uneasy.
I don't know if it was Bethesda's intention to make the choice the player can make in the civil war such a loaded question (including racism and nationalism, but also other touchy subjects such as imperialism and religious intolerance and persecution). But if it was their intention, they succeeded. Nothing about Skyrim sparks as lively a debate as a topic on the merits of the Stormcloak cause.