/lit/ - Literature

I need a source for something Nietzsche says about Socrates.

In twilight of the idols Nietzsche writes that a person came to Athens, who knew about faces, and told Socrates based on his face, that he was a monster, to which Socrates replied something along the lines of "You're on to me, sir!".

I need to find where Nietzsche got this from? Is it from one of Plato's dialogues and if so where? Or some other source?

Who is more disgraceful, the one commiting an injustice, or the one suffering from said deed?