I would believe the best way to do this is list subjects to and not to relate to. As well making some issues a verbal warning compared to a mute/ warning being given.I don't really see how we can make common sense more specific, anyways. Like, how does one make "it really just depends" more specific, without defining other rules? I dunno, really.
Giving simple examples. I just would rather there be a line where it is accepted but frowned upon.