Honestly, neither of the negative feedbacks really means much since you aren't on DefaultTrust and you have no particular reference to what happened. The only reference is you defending a known scammer named 'Bono'?

Instead of escalating the situation and trying to get people to leave him undeserved red, you could easily resolve the situation with him. Mutually deleting the negative trust would have squashed it all but you wanna push it cause of ego?