Try as much as hard as you can to not hate people. Because I, have felt how bad it is to hate people. I was never know how bad it would affect us to feel hatred on a person. But now I know, so deeply I know. It is really bad, not for the one you hate, but you yourself.
Hating on people might be really bad for you because, once you hate people, you are going to talk about their bad habit or anything bad about them ( yep, because this might be the reason you hate them ) and that will go on, and on, and on.
You keep on doing that kind of thing, and every single thing you'd want to talk only around that kind of topic, suddenly you know everything about them, it makes you more look like their fan than a hater.
You'd forget how to be grateful, you'd forget that you have a lot more important things to solve in your own life, because all the thing you think about is, about how to make this person being hated by many more people, you'd feel something heavy on your chest.
Your life will be not your life anymore, and you will not enjoy life, and you will never get enough of it. So if you catch up yourself hating on someone, just let them do what they do, don't talk about it, if the one you hate is your close friend, better to talk it straightly to them, kindly. :)