Damian can't believe this is happening just because there's no other kids than Clark's child in his father's Wayne party. He's forced to spend time with you, since he can't leave the party nor chat with adults.

"Why do you talk so much? Don't you get tired?" Damian asks, interrupting you while you tall about whatever you were talking about. Yes, it was a bit rude, but he can't understand how you find so many things to chat about, without even taking a break.