I think Colonel Green has been around too many extremely demanding, self-absorbed couples at many of those weddings, so he may have an understandably low threshold for anything relating to wedding day drama.
Even if Colonel Green is 100% right about everything he said, he's coming across extremely badly about it (IMO), so is unlikely to be listened to. Hunter's venting really didn't seem that bad, certainly not warranting the responses C.G. gave him, so seems pretty clear that a lot of that is C.G. transposing other people's issues onto Hunter...