I voted death to all the elves, but that's because I couldn't pick who I hated more. Wood Elves or High Elves? I hate them both with a burning passion. I like them Dark Elf lads though.
Freaking hippies. I respect people who play them, but can't stand the elves themselves. Granted, I hate hippies I see on the street, and add that to Elves, which I hate almost as much, and well... New levels of hatred. I am waiting eagerly for the new Wood Elves army book so that I get some feeling of accomplishment from beating them. Right now, it makes me feel more akin to a bully.
So much cheese... I nerdraged so hard when Teclis dispelled the demonic horde during the 'Gentle Breeze of Chaos'. It felt like the author was just too lazy to write anything about them. As if he believed it would be an awesome idea to have this second chaos army coming down to kill the first one, but then decided he had no idea what to do with them and just killed them off by giving some crippled elf a nice plate o' cheese.
Then you have Tryion. Idolized for doing... nothing. None of his feats are worthy enough to explain the amount of hero worship the High Elves give him. Milking the fame of your ancestor is just low. Arrogant cheese-mongers who think they are all that until the dwarfs come a calling wanting some phoenix crowns.
The most evil beings in Warhammer. I like them simply for that fact. While I will not argue that any race in warhammer is 'good', the Dark Elves (And Eldar for 40k) take the cake for raw evil.