IN NO PARTICULAR ORDER
I like killing:
Humans
Female Blood Elves (except maybe holy priests)
Rogues (except maybe the furry ones)
I dislike killing:
Taurens
Worgens
Pandarens
Shamans
Cat Druids
Bear Druids
Female Draenei
Holy priests
Hunter Pets (any)
Neutral on everything else.
EDIT: I added humans to my like to kill list since I forgot to.