Neither of your negative feedbacks say anything about doing a trade with you, it just says that you are annoying. Its not really abuse.
But just underneath his trust rating there is a written in red "trade with extreme caution" warning which is caused by negative trust brandished on him to me this is a dent on his profile.
I think there should be other means of handling misunderstanding amongst members with out the use of forum power by any of the two members.
The effect that a negative trust or a positive trust has on a profile is quite a heavy one that before it is giving should be something that Is quite tangible.