Nietzsche recalls the story that Socrates says that 'he has been a long time sick', meaning that life itself is a sickness; Nietszche accuses him of being a sick man, a man against the instincts of life, and hence a 'monstro animo' (a monstrous soul); Nietzsche is for war.
And because Socrates is the beloved of Plato, his reed-flute which his words and thoughts are refracted through he is against Plato too.
But far from being an ascetic Socrates married late, and then a much younger woman (Xanthippe); he says of her in Xenaphons Symposium:
And that is just my case. I wish to deal with human beings, to associate with man in general; hence my choice of wife. I know full well, if I can tolerate her spirit, I can with ease attach myself to every human being else.
He had three sons, and served in the army in three campaigns and with valour; he was a master-mason and ran a sophist school; and as Epistates (president of the assembly) in the Battle of Arginusae he resisted the judicial murder of the Generals for the failure to rescue sailors during battle.
This is hardly a man it seems who is against the instincts of life; so why Nietszches polemical calumny?