I rarely use the word hate but things that irk me:

fanatics in general...liberal, conservative, religious, environmental, feminist,
GLBT, pro life, pro choice or anyone else who believes thier ideals are absolute;

people who think they have some right to not be offended;

health nazi's;

most movies on the lifetime channel;

celebrities who think we care about their political or religious beliefs;

large people in spandex;

anorexic people in spandex;

most other drivers on the road;

voluntary ignorance.