Well im just back from a 72 hour ban for this very reason!
I was banned for profanity because I snapped after 10 mins or so at a group member that was harassing the whole group (apart from his friend) in fotm. Yes it probably wasn’t the right thing to do but hey everyone has a limit.
It seems to me, and at least in my case that its ok for a group member to verbally abuse and harass others and carry on like a child as long as you don’t use profanity.
Trying to get some kind of support from anet / ncfail on this issue proved to be pointless and non existent.