In a world where you have people of different faces, color, tribes, races, beliefs, religion, ideas etc, it is only natural to have misunderstanding that will lead to enmity and ultimately hate. As humans, when we do not agree with certain ways, we naturally develop dislike for it.
Now hate is a really strong feeling that stirs from our personal dislikes when we don't keep it that way, when we let this feeling of dislike grow into something sinister. If we all learned to respect, tolerate and understand other people alongside the way they choose to live, there'd be less hate in this world.
Respect for others is very important. We need to understand that people differ and we can't force certain ways up on others else hate will flourish.