If it is purely about LotC, then I understand. However, many members do know eachother outside of LotC, and, as has been seen, have had falling outs. I would hate to see skype logs misused this way.
Whatever they said cannot hypothetically hurt you, if you do not allow it. Feast off of their anger, and let it nourish you... But ya, I guess the ban-worthy-ness really depends on the situation.