Some classic examples of the polite insult from F E Smith KC:-

• Judge: Are you trying to show contempt for this court, Mr Smith?
  Smith: No, My Lord. I am attempting to conceal it.

• Judge: Have you ever heard of a saying by Bacon — the great Bacon — that youth and discretion are ill-wedded companions?
  Smith: Yes, I have. And have you ever heard of a saying of Bacon — the great Bacon — that a much-talking judge is like an ill-tuned cymbal?

• Smith (to witness): So, you were as drunk as a judge?
  Judge (interjecting): You mean as drunk as a lord?
  Smith: Yes, My Lord.

• Master of the Rolls: Really, Mr Smith, do give this Court credit for some little intelligence.
  Smith: That is the mistake I made in the Court below, My Lord.

• Judge I’ve listened to you for an hour and I’m none wiser.
  Smith: None the wiser, perhaps, my lord, but certainly better informed.

F E Smith went on to become Lord Chancellor of Great Britain (as the 1st Earl of Birkenhead).

Source of quotes:  Wikiquote