Many things create hate. It seems unavoidable at times. From small-scale to the things that cause war, these are hate-causing actions:

• Invading others' space (mental, emotional, physical)
• Forcing change, dominance of will upon others
• Taking others' stuff & relationships
• Prohibiting others from expressions of self-determination
• Forcing a change in belief system/religion
• Betrayal, Deceit, and Abuse