From the Gnomologium Vaticanum 371
“Kleostratos the drunk, when someone asked him in admonishment “Aren’t you ashamed to be drunk?”, responded “Aren’t you ashamed of admonishing a drunk?”
Κλεόστρατος ὁ φιλοπότης, ὡς μεθύοντά τις αὐτὸν ἐνουθέτει λέγων· „οὐκ αἰσχύνῃ μεθύων”; ἔφη· „σὺ δὲ οὐκ αἰσχύνῃ μεθύοντα νουθετῶν”.
And, whether dry or wet, the following saying might be useful too:
“Plato used to say “It is not fine for an educated man to converse with the uneducated, just as for sober man to talk with the drunk.”
Πλάτων ἔφη· „οὐ καλὸν πεπαιδευμένον ἐν ἀπαιδεύτοις διαλέγεσθαι, ὥσπερ οὐδὲ νήφοντα ἐν μεθύουσιν.”