How do you end Good ol boy club?

Not a whole lot you can do, especially IF you're the outsider. I had a similar situation with the group I joined in Iraq. The unit had come from Arkansas and I was from South Carolina. I could do no right, in their eyes. I even had a Specialist that was friends with the Sergeant Major, probably in more ways than one. She asked me to do certain jobs, that she probably wouldn’t give to others or do herself, because she informed me, she was passing information from the Sergeant Major...I knew better. I lived thru it and parted ways after we got back...have not spoken or seen any of them since.

Really hard, I saw a USAR unit where the Commander and 1/2 the unit worked together in his business stateside. Caused many problems

Look, most Guard and Reserve have a different type of relationship based on the nature of their service. While I do not ascribe to the GOBC, as long as it is not impacting the units readiness posture and relationships are not being abused professionally then just ignore it. If it is rampant and effecting the organization, speak to the most senior person you trust that is not in the group. Thank you for your service.