So today I wanted to say thanks, on behalf of the HN community.
By all means downvote me, btw. This backslapping post on the front page only wants to hear about how amazing the mods are, so the bias is pretty evident.
The right response here is simply to ask for further substantiation, as danso did. It's not clear to me that the mods are directly responsible for what you've experienced. If you haven't, I would contact them for clarification.
Suppose he is being treated unfairly by the mods. Is that not worth complaining about?
I don't give a crap about some silly "downvote every comment complaining about downvotes" rule. Complaining about downvotes was frowned upon because people get inexplicably downvoted as a matter of course here, and the frequency of complaints was deemed sufficiently detracting to warrant being frowned upon. Being treated unfairly by the mods, however, is another matter entirely.
I haven't seen a preponderance of evidence suggesting the complaint was ill-founded, and the guy's tenure and comment history (what I looked through of it) do not suggest he's an ill-mannered troll, so I reserve judgement as to whether the complaint is in the wrong. Like any reasonable person would.