I have just recently, after HF went live, created another character and he will be my 4th. All characters before this one went with the Stormcloaks in the civil war. I have just recently started looking a little more closely into Elder Scrolls lore. Last night i ordered online that book by Greg Klein (i think that is how you spell his name), The Infernal City, Which is the first in his Elder Scrolls series.
Anyways, I am getting off topic, I am planning on going Imperial with this dark elf for a change and was wondering, from an RP or lore aspect would there be any significant reason why a dark elf would choose not to side with and maybe even hate Ulfric Stormcloak? I was thinking maybe racial reasons.. because i get the impression that Ulfric is a notorious racist to anyone that is not nord. Is this true?
Or would there perhaps be even more significant reasons why a dark elf would choose not to side with the stormcloaks, besides racism?

-Thanks