And the Dunmer in Windhelm make such a loud ruckus about being segregated to the Gray Quarter, when as I've said, the Ratway in Riften would be a much worse place to live. Perhaps, as the Altmer in Windhelm says, if they started "playing by the rules" a little more, maybe they'd get further ahead, instead of simply demanding a right to be "important" citizens.
Addendum: When I say playing by the rules, I do mean bribery and underhanded business methods, as the Altmer seems to imply got her ahead. I won't deny, contrary to my lofty view of the Stormcloaks, that Ulfric is an extremely poor king, and Windhelm itself looks like a poor place to live, Gray Quarter or no.
To the Ninja above: Again, Orcs... Orcs...
Orcs are not true Mer. The fall of Trinimac and the rise of Malacath have since marked them as a race apart, as is their nature and title; The Pariah Folk.
The fact still stands that Dunmer are strong. You're forgetting that Boethiah is widely worshipped by the Dark Elves and she forces her followers in becoming ambitious and independent. She's the Kyne to the Dunmer; a warrior goddess who pushes them hard whether they want to or not. The whole reason why Dark Elves are so robust is because of Her strictures. Without Her they'd never make it in Morrowind.
Also, they're not asking for preferable treatment. Asking not being threatened or discriminated against, is not asking much. In fact, for any decent leader, that's a given.
Face it. The only reason why the Nords don't like the Dunmer is because they're Dunmer. They've broken no laws and aren't trying to make life hard for other people. In fact, whenever something bad happens to them, the guard does nothing. So you can't blame them for being a little bitter, despite the fact that their presence in the city is completely benign. In fact, they've opened a few businesses so they're actually making Windhelm a better place to live.