1. IGNORANCE
Most Nords tend to agree that Ulfric Stormcloak is the one to follow. Pfff. Although I can understand that Nords want their province back, they are ignorant to not face the fact that a victorious Stormcloak rebellion would only mean the Thalmor come in and smash their asses. Their best bet is most definitely to stand by the Empire for the time being, like in the Great War when they aided them in the Imperial City, because the Aldmeri Dominion is way, way, way too powerful for the Nords to fend off.
2. RACISM
Probably the most racist of the races; Orcs can be a bit discriminative of other races but at least stick to their strongholds, rather than, for example that [censored] Nord living in Windhelm who feels the need to walk through the Gray Quarter shouting insults at the Elves. Khajiits have to stick to living outside cities, any Elf is unwelcome in Skyrim, and Argonians get a pretty rough time. The Nords simply hate other races living in their province ("Skyrim belongs to the Nords!"), unlike for example Imperials who welcome anyone into Cyrodiil.
3. DRINKING PROBLEMS
Practically all Nords sit around all day getting hammered in inns, some Nord NPCs only having lines such as "are you gonna buy me another drink or not?" (or something along those lines). Even Jorrvaskr, they sit all day in their mead hall doing nothing but drink.
4. HATRID OF MAGIC
Boohoo some insane magic users following Mehrunes Dagon caused the Oblivion Crisis, therefore all magic must be awful! This attitude annoys me, magic in TES is great, and they dismiss it in practically all forms. Except of course the College of Winterhold. but they still claim that they College members caused the Great Collapse (if you ask me it was merely the Sea of Ghosts, and the College is still upright because of its magical protections.