Isaiah 36:11

‘Then Eliakim and Shebna and Joah said to the Rabshakeh, “Speak I pray you to your servants in Aramaic, for we understand it, and do not speak to us in the Judean language in the ears of the people on the wall.” '

The three were becoming concerned about the effect on the people of the Rabshakeh's words, and requested that the Rabshakeh continue in Aramaic, the official international language. There is an implied rebuke here, the suggestion that it was not polite for him to proclaim an official message to Hezekiah in such a public fashion. It should be made in the language of diplomacy. There was also possibly an indication of offence being taken because he seemed to be implying that they could not speak Aramaic.