It's also possible you were the only "saved" individual in the room.

You said your dad was not religious.

Obviously, Bush, his wife and that whole crowd are demonically possessed.

So you stood out.

It's weird, the more I ponder this, the more I feel like the spiritual aspect of this explains his reaction. It wasn't how you looked or that you may have been older or younger than he expected. If you had been, he would have said so, probably congenially, "Oh, you're younger than I expected."