The King is giving Macbeth the title; the Thane of Cawdor. Who had Macbeth and Banquo been fighting? He instructs Ross to go execute the Thane of Cawdor, so that the King can give the title to Macbeth and the Thane of Cawdor has been disloyal to the King.
(without context) i would say sarcastic due to his wording.
I don't know sorry for that
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