In The Anatomy of Melancholy, Robert Burton states that
"When the son swore, Diogenes struck the father."
Where did Burton get this from? I can find no earlier (i.e. Classical) reference to it, nor any suggestion that Diogenes in fact did it. I am wondering if Burton made it up and, as it were," hung" it on Diogenes.
Edit: The nearest I can find to Burton's claim is this (unreferenced) quote:
"Why not whip the teacher when the pupil misbehaves?"