One thing to keep in mind is that the NN is treated just like FC and LS chats when it comes to moderation by GMs. SE's rule for those channels is that they are player moderated and they will only step in if the person is doing something really really really atrocious. Such as telling people to kill themselves or making death threats. While it sucks that it means people can make disparaging remarks towards each other and get rather nasty, you do have the tools to deal with this in these settings such as kicking from the chat and black listing. Now if they intentionally attempt to circumvent those, THEN the GMs will step in.