So I was looking in to these claims of racism of the stormcloaks...and couldn't find it.
I talked to the dunmer first. About half are ok with the stormcloaks. They work hard and are treated well.(And are annoyed by the other half's whining) One works for Kjar the ship captain and notes that though he demands hard work, he rewards his crew well. Another notes that he and his sister work for a nord farm and doesn't have any gripes, and that his brother is ashamed of him for it. I found a http://www.imperial-library.info/content/skyrim-dunmer-skyrim in one of the other dunmer's houses.
I checked to see if any of the actual stormcloak troops around the city had racist dispositions. Amidst the mouth watering mentions of sweet rolls and the horrors of knee injuries, the guards noticed I had some goods to sell. Did they refer me to the nordic marketplace? Nope. Try Sadri's used goods they said. You heard that right, they referred me to give business to the only dark elf shop in Windhelm.
As I checked around the nordic marketplace, I noticed a high elf amongst them. I talked to her about the dark elf's condition. She noted that she didn't have it easy either when she first showed up, nords are distrustful of outsiders due to the history they've had with them. She got to know them though, and proved her service to be valuable and she had grown to become accepted.
Still, there's those argonians outside of town...so I decided to check in on them. The first one I come to says this to me immediately. "We don't like your kind around here." Take note that my character was a Breton, not a nord. Maybe he's just having a grumpy day, I talk to him again. "If you fall in the water, I'm not going to save you." Come on man, It's not like I murdered your dog or something. "Some people tend to go missing around the docks"

Ooook....I think I'm done talking to him. Lets check with another one. "I hear there's a special batch of skooma in the dunmer cornerclub, would you steal it for me?" Steal drugs for you? No thanks. "Hist spit on you." What a kind fellow. The other two argonians seem alright, although I seem to recall shahvee mentioning she'd stab me in a previous game. Looks like a case of some bad apples spoiling the bunch.
I wander around outside town and come across Hlaalu farm, owned and operated by a dunmer. A nord works for him.
Unfortunately a dragon interrupted my checking in there and I had to stop my investigation.
So a drunk in windhelm who isn't even a part of the stormcloak army seems to be the one true face of the stormcloak movement to everyone. Not sure why they don't consider the imperial captain at the beginning of the game as the one true face of the imperial legion.