@EventHandler
    public void tab(TabCompleteEvent e) {
        if (e.getSender() instanceof ProxiedPlayer) {
            ProxiedPlayer p = (ProxiedPlayer) e.getSender();
            if (p.hasPermission("pex do tabowania")) {
                return;
            }
            e.setCancelled(true);
            //msg jak chcesz
        }
    }