I kind of agree here. I mean, to an extent. At this point, they're definitely a separate culture... the only issue is that most of the world (that we've seen so far) is fairly heavily influenced by that culture. Parts of Skyrim, including the capitol, strongly draw on Cyrodiil for things such as food and architecture.
Even Windhelm has some pretty strong Imperial influence... particularly architecturally.
Oh wait... this is a joke thread. I'm sorry. = )
Remember: IamI3rian told ya. Funner is NOT a word if you're older than seven.