He legendarily never forgets a slight. Twenty-five years ago, Vanity Fair editor Grayson Carter called Trump a "short-fingered vulgarian," and to this day it rankles Trump. He sends Carter pictures of his fingers, insisting they are normal size. 

...
He can't let go of any slight. His whole life has been devoted to refuting those who doubt the awesomeness of Trump.

In-ter-es-ting-uh. Stuff like that gets to him, personal stuff. "Short-fingered vulgarian": Note being called a "vulgarian" didn't get to him, being called "short-fingered" got to him. Short-fingered. Does he have a short dick?