I agree. I only tag accounts as shitposters if it is obvious to even the brain dead fool. All one or less liners, no contribution to the post.
To date, I have left negative feedback for 61 shitposters, and most, if not all, have never complained about it.
Actually, based on the definition of negative rating as per forum guideline it means "You were scammed or you strongly believe that this person is a scammer." which I think I does not fit to the rating he gave, in fact in my experience, I have successful transaction with "minerjones" ,"hilariousandco ", and "AT101ET", these people are trustworthy and I don't think they will transact with me if I am a scammer or untrustworthy.
Lastly, let us be objective, please think twice before making a decision as it's your reputation is at risk here since you are a DT and maybe some would think those who choose you to as DT has low standard which in overall will affect the forum's reputation. You should be focus more on people who are scamming than focusing on shitposters as your definition with your own judgment, let the staff do their job as they have the appropriate power to do so.
I think that you are being bias here because you are wearing signature and you are also making money from it, so how can we expect that you are not making it for your self interest to minimize the competition.