As I've said a few times before, I'm not a fan of leaving counter feedbacks in general. In this case, it looks like the counter was left by Vod simply because he doesn't trust OgNasty--with no regard as to whether the neg was valid or not. That's not good.
People change over time, and I think Vod might have let his hatred (for lack of a better word) of OgNasty cloud his judgement, and Vod had also done some odd things with another member he was feuding with (can't remember the user's name), stuff that I wouldn't have thought he would do. But I've got mixed feelings about removing him from the DT list. He's left far more valid feedbacks than bad ones over a very long time period, and I think that has to be taken into account.
I do think this is a valid discussion, however.