Satan is the representative of the Universe, let us hate each other for Satan. Satan is the representative of Universe, but let us love each other for Christ instead.
Hate is the absence of love, by the definition being used.
You need to identify who and what they are really loving in order to identify the true origin of the act. Everything that every life form does is, to that life form, a necessity in their attempt to survive and experience the Universe, and to maintain the connection they feel towards certain objects and certain life forms, thus it is a form of love to them. There must be a balance somewhere where all life forms can all experience love, peace, and freedom together. It's just about as simple as that. The choices are up to you, every split second of your existence.