Symptoms of hatred show up as anger, hostility, dislike, aversion, or ill-will; wishing harm or suffering upon another person.
With aversion, you habitually resist, deny, and avoid unpleasant feelings, circumstances, and people you do not like. You want everything to be pleasant, comfortable, and satisfying all the time.
This behavior simply reinforces your perception of duality and separation. Hatred or anger thrusts you into a vicious cycle of always finding conflict and enemies everywhere around you.
When there is conflict or perceived enemies around you, your mind is neurotic, never calm, you are endlessly occupied with strategies of self-protection or revenge.
You can also create conflict within yourself when you have an aversion to your own uncomfortable feelings.
With hatred and aversion, you deny, resist, and push away your own inner feelings of fear, hurt, loneliness, and so forth, treating these feelings like an internal enemy.
With the poison of hatred, you create conflict and enemies in the World around you and within your own being.