Hmm.  Looks like all the feedback bob123 has sent since the one in question has been valid.  I didn't look at feedback left for members prior to that one, but I did take a look at pretty much all of the ones afterward and I don't see any instances of abuse, much less a pattern.

This looks to me like one wrongly-left neg among a great number of ones that were left for valid reasons.  Hopefully bob123 might revisit this one, but if not I don't think it makes a case for kicking him off DT or anything like that.  Quite a few DTs have controversial feedbacks, as I'm sure you're aware, Veleor.