Nietzsche diagnoses Christian slave morality and Roman master morality. In fact his diagnosis can be extended to modern democratic and Marxist slave morality and modern political and lobbygroup master morality.
It is interesting to see that, under libertarian universal morality, the slave morality and the master morality become equal. Because of this universality there is no exception in the slave morality that allows for a separate master morality to exist.
Nietzsche wanted everybody to support the master morality. This is in fact realized if libertarian morality is adopted.