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no
You denying all the facts simply makes his allegation that you're unprofessional sound more realistic.
I have never dealt or even interacted with that person in the past. To say that I previously disliked him and gave him a negative as a result is ridiculous
I never actually said or implied that. Perhaps you're misinterpreting what I say.
ruining his credibility in the eyes of those that follow default trust for having an unsuccessful transaction with him is not required.
To clarify:
To me it seems like you gave him a negative rating for having an unsuccessful transaction with him while he never scammed you.
And you're telling me that he could end up being a scammer later? Is this a prophecy? Because he couldn't scam you or the seller in the transaction you were handling even if he wanted to. And this is not how trust ratings are supposed to work.
No. You said
What quickseller is doing is basically using his position in level 2 default trust to send negative trust ratings to users that he dislikes. It's kinda sad that the trust system has come to this
You said nothing about a failed transaction.
However to address your concerns, it is not only appropriate to leave negative trust when someone scammed you, otherwise when new users get scammed, the scammer will never receive actual negative trust.
The negative trust was the result of scammy behavior. Period