Becoming what you hate

I have been warned by many sane people to not hate anyone or anything. They say that you eventually become what you hate.
I used to hate slobs or ... in some sense ... people with no goals. Needless to say, I have become one of them. I dont intend to make whine in this post, but rather to declare that I do know what I am, and to say that as of now, I'm quite happy being this way.
Having a purpose is over-rated. Aimlessness, can be tough on you, but teaches you a lot of things that you never intended to learn.