You may just be right! First time I’ve heard skin referenced without color as the modifier. Thin skinned and vengeful sounds correct. Which leads to another question: the rumor is repeated that McCabe told his group, “F**k Flynn and then we F**k Trump”. Could this infamous order have originated in the People’s House from the lips of a thin-skinned, angry, frightened man who knew that both those men would stop at nothing to get to the truth?
I don't think Obama cared about the truth, he just wanted to hit back at someone whom he believed had "disrespected" him.