Hate is Spiritual Cancer.
Have you ever hated someone so much in your life that your body and mind starts to give off a displeasing feeling? They might have bullied you or worse, but isn't it unfair that after all they have done, you can do nothing but hate and it comes back and harms you?
Many people in this world go through this same feeling, but the social and moral system is rigged for now as we know (we can change it slowly), but the whole point comes to "how do we live in such a way that nothing affects us anymore and we can live happily without hate?"
Try looking this world and your life from a 3rd person's perspective time to time, as if it is a cinema, I know it sounds difficult and certainly is, but once you have a habit of doing that you will slowly observe the pattern of hate and your mind and what it is trying to teach you. The target should not be the elimination of hate but to increase the understanding.
We as ego based creatures either think that "whole universe is against me" or "whole universe is working for me", but both sentences are declaration of ego. To see the situation as it is, and taking it as a game where we progress with each situation and each level and each person, certainly helps. Once we experience this hate we realise it's a binding and trapping process for psyche and mind, as love liberates, hate traps, if you don't eliminate hate blockages on psyche and mind will start increasing..
And these habits form with time, you can't impose learning, but don't be afraid of circumstances, just know that there is a force always working for you and your best interests and you are not alone. If you have anything to share on how you are countering this emotion pls do as I too have a lot to learn.