'David says...'
'Yes, you're correct, I have set the completion date as the 15th. It's all in hand.'
'David says...'
'Yes. Those were the instructions I gave David'.
'David says...' (utter bollocks)
That's interesting. I'll call him in and check that he hasn't misunderstood my instructions - can I get back to you on this later today?'.
'Thank you, David. The Management meetings are already in the diary, so please don't worry, I'll let you know what you need to do once we've agreed the outcome and targets for each member of the team'.
'Already sorted, thanks.'
'I'll let you know when something affects your remit, thank you, David'.
'That's a very good idea, David. Why don't you come up with something and submit it to me? I could give it a check just to make sure everything's in order and, if it is, I'll take it forward.'
Nothing particularly confrontational about it. But the language is all about how calm, rather than pissed off you are.
And if he starts barking at you, rather than getting visibly flustered, The Look helps. Followed by an ice cold 'would you like to go outside, then come back in and try that again?' 'What for?' 'Well, I'm fairly certain that you didn't actually mean to speak to me in that way, so I'd far rather gave you the benefit of the doubt on this'.