I'll take that as secession.
If you want to, then by all means.
Based on what evidence or conjecture?
I assume the Dunmer moved to Skyrim/Windhelm before this rebellion business correct? The Dunmer never mentioned the Nords EVER treating them well or even decently, and the Nords have a history of bigotry against Elves. And considering how Ulfric is like?
I'd say thats enough to make a reasonable assumption.
Argonians? They're mammals, but you can only tell because they have briasts. These things are extremely alien and alien things are hard to relate to. Furthermore they look like Dragons. Compound this with that Dunmer had enslaved them. I understand why the proud Nord people only see them as a beast race.
Ignoring the fact  that they totally owned the Dunmer when they had the opportunity, and the fact that they're the only race who drove back the Daedra during the Oblivion crisis with relative ease(Forcing THEM to close the Oblivion Gates). I don't see how the Nords can see them as "Just" a Beast Race.
Redguards: I haven't seen any negative opinion of redguards unless you count the mercenary warband and they were turned away because they were a warband - not because of their race.
That's why I added a "maybe".
Bosmer: As a personal shortcoming, I have a hard time telling them apart from dunmer in Skyrim so I can't really comment on this one.
Here's a hint. One is grey with red eyes. The other isn't.
Bretons/Reachmen: They want Nord land and no matter how you slice it, it is nord land. Nords were the first humans down from Atmorra and they haven't really moved since.
Because every Breton is a Reachman correct? Plus I think they just don't like them because they practice magic, and are half elven. Pretty crappy reasons right there.
Khajiit? Ignorance. Just about everyone thinks they're [censored] - even Imperials - because the majority of their renown comes from highwaymen. Compound this with that Khajiit were the second race to join the Aldmeri Dominion.
Imperials? Duh.
Orcs: I haven't seen Orcs treated poorly either.
Altmer: Boy howdy, I wonder.
Still not a good excuse to treat every member of those species like crap.
No the first person to get frustrated is the one who puts forward an excellent argument only for it to be blatantly ignored by a ignorant elf loving [censored]. Go and [censored] an elf. Scaly piece of [censored].
That actually sounds like a nice idea. I think I will.