how would you treat people who talks negatively about you?

First of all, I will try to find out whether Am I really going negative? If yes, then I will try correct myself, and will be thankful to that person. If I am not going negative then will just ignore that person, and will think positively about myself.

Ultimately I think it depends on what has been said, in what context, who has said it, and how it'll effect you if nothing is done about it. Effectively, the issue needs to be spoken about with the person who said the negative comments, not a person who just passed on the message. One problem with this, is that when confronted, most people close up and deny everything, which makes getting past the issue a problem. One thing I've learnt so far, is ignoring it, while not easy to do, is the best way. If you ignore it (don't comment on it to anyone, don't mention it, don't even think about it) eventually it'll go away. If people aren't getting a reaction out of you, they will soon get bored with the topic and move on.