This is sort of a weird thing to say. Do you mean that their style of modding seems wrong to you? Or do you literally mean that you think that they, personally, are an immoral human being? Because really, if it doesn't affect their modding, who cares?
I'm saying that I personally think I witnessed a mod took a stance, that if he/she wasn't a mod, it was not a stance that would've been accepted. Not even talking about mod level of acceptance, even regular members didn't approve it.
If GAF is too strict on members, then I think, sometimes, they can be too lenient on mods. And to me personally, without that red name, that person is nothing to me. There's no personal vendetta from either side, it's just that I really dislike moralities that suck. And that's why I like GAF, cause the morality is high, tolerance is generally low. Heck, even I got hit by the banhammer twice, and one warning, even though I try my best to generally be a good contributor: sometimes you slip. I agreed on the bans.
If you feel a moderator is posting in an aggressive or unproductive manner, please PM another moderator to point it out. Even if you're talking about something that's not against the rules, but just... not good posting. Moderators should be setting a good example.
The case is a bit old and I have no personal vendetta, so yeah, I'm not planning to bring it up now. I also think I saw another red name pop up in the same thread and since he/she didn't take action, I guess it was acceptable on GAF. But really, I was really close to start PM'ing, but once I saw another red name and nothing happened, I gave up on that thought.
Edit: Actually, thanks Stumpokapow for the advice. I think next time if I see something completely awkward (something you totally don't expect from a mod), then I'll just pm and ask for a 2nd opinion from another mod if that's supposed to be normal.
Sorry for trying to be vague (on purpose), it makes it kinda annoying for people who read my text as if I'm teasing a story. That wasn't my point and I don't feel like indirectly attacking someone for something in the past, so I'm keeping it vague.