No specific answer here, only a reflection that this is a place where process becomes really important: when there's no structure in place to even begin looking at bad behavior (or sub-optimal behavior) then it falls to individuals to intervene, which makes conflict hard to avoid. Even having guidelines on paper and a rotation for who enforces them or brings up grievances can be helpful. My experience in some groups has been that a) creating a process helps establish a space where people can participate without it becoming personal, b) starting anywhere and iterating upon what you've got is better than having nothing
love love love,
Josh