"From her first recognition of his presence (“Donald, it’s good to be with you”) to her few pointed zingers (“Donald, I know you live in your own reality, but those are not the facts”), Clinton reduced her opponent to a casual first-name sparring partner. This is a man who loves his last name so much, he’s embroidered it on tie labels, stamped it on steaks, and splattered it in gold all over a chain of tacky hotels. Clinton's refusal to use it must be grating at his quivering ego."

http://www.slate.com/blogs/xx_factor/2016/09/26/clinton_only_called_trump_donald_during_debate_in_a_major_power_move.html