NodeBB permissions are additive only, there are no negative permissions such as denying a specific user or group.
Sorry to bump an old topic; are there any plans to implement such a feature anyway? Or is there a way we can build this ourselves? Its a pain right now to organize birthday gifts and allow everyone but one person.
Some others have asked about it as well. I tried to do it but was unsuccessful. I think the problem is RequireJS, it might work with the proper configuration of requirejs and angular, but I haven't been able to figure it out.
