I thought this was the case when T-Rex was so calm about the remarks Trump was making. If Tillerson was truly upset, he would have walked out at that point. He already knows something. The rough remarks had to be made though, just to get Little Kim’s attention. You want to rattle some sabers? We can rattle them too, and just as loudly!
It's part of the dialog, you know, like when Kennedy put a blockade on Cuber.