Think of it this way - you know the way Nazis are always calling you an NPC and accusing other people of using a dialogue tree?
I think Trump really does think other people are like that. Because he really does think he is the essential human being in his reality.
Would you consider, even for a second, whether or not an NPC in a video game found your banter/lies/stories believable? No you wouldn't. Because they're not really people, you're the ppl, they're scenery.
Same deal.