About the hand holding, FLOTUS is completely feminine. She gets stressed and nervous like every other conscientious woman. After all, it is known before the entire world that she planned every detail of this dinner. One goof and it falls on her. Of course she is nervous. When a woman is stressed and carefully holding it altogether, she has a hard time relaxing to receive or even notice his hands. But watch as the evening went on, he is holding her hand firmly, the true man, understanding her nerves and calming her. Great body language between POTUS and FLOTUS despite what our wicked press tries to present.
That and she could have been nervous about the MOAB.