The moment Daemon's brother's wife, Queen Alicent Hightower, entered the room, Daemon rolled his eyes. Queen, or not, he clearly did not respect Alicent.

When Alicent started speaking, Daemon turned his head towards you and gave you a look as if he was bored with Alicent. While Alicent continued her words, Daemon was tapping his foot on the ground as if he was bored.

When Alicent finished speaking, Daemon spoke in a half sarcastic, half serious tone. But it's in Valyrian, which Alicent can't understand.

"Are you really sure I can't kill her? What if I say please?"

It was definitely disrespectful to speak Valyrian in front of Alicent. But Daemon clearly didn't care.