Biff and rewatched the S3E5 episode with Holly. I'm not sure who wrote a comment before, but when LG says he is an amazing man as he is leaving her bungalow, DM absolutely says "No, I'm not". I think someone else thought he said something else, but it's very clear that this is what he says.
Also, we looked up "Lord Muck", Mrs. Lamb's little snide remark about DM, and learned it is "Informal an ordinary man behaving or being treated as if he were aristocratic". You know, for Mrs. Lamb being so stupid, she really did peg DM's presentation in the village in a very astute manner.