I wanted to make an update pointing out the fact that Hippietech is continuing to abuse the feedback system here by deleting and then reapplying one of his negative ratings for me in order to attempt to keep my rating from returning to normalcy repeatedly after I have received multiple new ratings. He monitors my ratings, and when he sees someone leave a new positive one, he deletes just one of his negative ratings and reapplys it to game the trust system over and over. According to Theymos this is trust rating abuse and is not allowed, yet here he is doing it.
...It's entirely legitimate to give someone a new positive rating just to negate a negative rating. (In this case you should explicitly respond to the negative rating you're negating.) It is not legitimate to keep deleting and reposting negative ratings to put the system back into "this guy just turned scammer!" mode. People who do that shouldn't be trusted.