In the thousands of years he had lived, Raegar had experienced many things. He had experienced every emotion a man could have.
Sadness, Anger, Happiness, Pride, and so on.
He had experienced all of these, and no emotion or experience was truly 'new' for him. However, for the first time since he could remember, Raegar was truly stunned.
The blatant disdain, disregard, and indifference that Pamela had towards him was extremely shocking to him.
Not only did Pamela treat him like air, but she even had the audacity to tell him that she chose to fight him instead of his subordinate because he was weaker.
He, Raegar, Slayer of the Night King, The Crimson Blade of Falling Sky, and the Ascendant of the Crimson Sky was weaker than his subordinate?
He was being used as a chess piece by an Outsider who was two levels below him?