How about all of the "popular kids" at any school I've ever went to. They have such a great time walking around like they're better than anyone. Little do they know, that after high school, nobody cares who they are or how popular they once were.
I try to do my best and I do not hold in my memory the people whom I dislike. I think that the best way is to neglect them and throw away all memories about them. And I am sure that there are many interesting and useful things to remember in our life.
OK no hating issue any more but sometimes the attitude of some people is so annoying and it hurts you to quite an extent. I think everyone should be considerate, do the things that you want others to do you...isn't it fair enough?