So how do i get rid of this "red" trust??
I have had 2 offers from the buyer saying if i remove my bad trust rating he will then do the same for me, should i give in???
Well, you were eventually paid, so I don't see why you shouldn't give in. Everything turned out fine, so it might have just been a communication issue or other misunderstanding. However, if someone never made things right, I, personally, then would not remove the negative feedback.
Maybe an improvement would be when someone gets negative feedback, if they do not get any other negative feedback for a certain period of time (say 6 months), then that feedback no longer counts towards their trust rating. If they get a second negative feedback in that time, both permanently count towards their trust score.
This does not mean that people can scam once every 6 months and not affect their trust score, as obvious scams usually get negative feedback from multiple trusted members at once.
This is the case.
Also, in cases where there is clear blackmail or if you otherwise dispute someone's feedback, you can PM everyone that trusts the blackmailing user and ask them to stop trusting them.