He's doing his best not to watch you with too much amusement. Hey, you asked and he answered.

"Don't worry, I've had enough time to get used to reactions along the same vein." It's not that he and Hikaru hid who they were to each other, there just wasn't any real need to broadcast who they were to each other. The people who mattered already knew, and those who needed to know would get around to hearing about it.

He does look apologetic though. "Sorry about that."