On Nirn the Tsaesci are Vampire-Snake-Men with human slaves. Human slaves who happen to be the ones seen in Oblivion.
The Empire adopted a lot of Akaviri symbolism (the dragon, blades armor, etc.) out of both fear and respect of the Tsaesci and their human warriors.
So, are the Tang-Mo monkey men an insult to the Chinese or are they just monkeys fighting off the endless hordes of the snow-demons to the north? (ZOMG! Kim Jong Il!)
Get a grip man, it's a game and the eastern-flavored lore was written during a drunken stupor and was weird enough to keep