Originally Posted by wikipedia
Often the verb "to hate" is used casually as an exaggeration to describe things one merely dislikes, such as a particular style of architecture, a certain climate or some particular kind of food.
"Hatred" is also used to describe feelings of prejudice, bigotry or condemnation (see shunning) against a class of people and members of that class.
The passions of hate arise from several features of our thinking process. These include a desire to strengthen our community and to alleviate our fear. The ability to quickly separate friend from foe is essential to self-defense and safety and provides the origins of hate.[1]
However, hatred in modern life is frequently unrelated to survival or self-defense. People are capable of hating others for any particular reason, people with different political and religious views, different lifestyles, and fans of opposing sports teams, to name but a few.