Having read this thread through, I feel more strongly that the Neutral Evil response to this DM is the appropriate one.
You'll never win a vote with the DM's girlfriend, sister, and sister's SO. Open communication only leads to you being on the outside here. So, you need to start assuming that there are no rules.
...
If your DM breaks the social contract, you're a sucker if you keep the social contract while he breaks it when it comes to rules, rewards, tactics, encounter design and adventure design.
You're playing a new game, "guess what I'm thinking" and there's only one way to play that game... steal his notes.