How do I know if someone has given me a positive/negative rating

I can't see if you are giving me postive or negative rating. It is a secret which only mylot admin can tell you. They do it for the sake of user's security, otherwise it will cause a big fight over here. All, I would say that forget about ratings and try to make posts and posts and posts. That would do wonders for you. The only way to negate a negative rating is to get more and more positive ratings.

Do we come to know such kind of stuff on mylot. I did not know. I am unsure if we can find out who has given us a negetive or a positive rating.