Nietzsche’s obscure choice of words, namely “the lonely one”, indicates that he felt that more than one group of people were suffering. “The lonely one” could be the friendless child, the woman in a man’s world, the leader making necessary but unpopular decision or the black man in a sea of white; any person wronged due to the social hegemonies and prejudices of the day.
Nietzsche goes on to encourage those feeling isolated to continue to strive towards being good people regardless of their treatment from others. The phrase “shine less for them” can be interpreted to mean that, for example,