docs: def not_user_filter(config, message, fasnick=None, *args, **kw):
      """ Everything except a particular user
  
      Use this rule to exclude messages that are associated with one or more
      users. Specify several users by separating them with a comma ','.
      """
  
      fasnick = kw.get('fasnick', fasnick)
      if not fasnick:
          return False
  
      fasnick = (fasnick or []) and fasnick.split(',')
      valid = True
      for nick in fasnick:
          if nick.strip() in fmn.rules.utils.msg2usernames(message, **config):
              valid = False
              break
  
      return valid