One of the most annoying things in TES for me are the stereotypes.
Such as "He's a Breton he can't be a warrior" and "He's an Orc he can't be a Mage",you know how it is,there are countless cases in which people think there is " Race--->Class ".
Well,I think it's annoying.
Let me begin with an example,the Orc in the College of Winterhold,Urag Gro-Shub.
He's a librarian,a Mage,and guess what,he's an Orc.
Another example,there was a Mages Guild in Orsinium and the Arch-Mage was an Orc and a Necromancer.
Of course I can bring you countless examples of these things but I think you got the idea.