My feeling about Trump is that he has the thinnest of thin skins. He seems unable to withstand even the mildest of criticisms and appears to have a need to be constantly revered, so much so that he will actually congratulate himself if no one else is doing it.
I don't know anything about his upbringing, but I do wonder if, as a child, he just wasn't given enough attention, or was made to feel inadequate in some way - because that amount of craving for admiration is almost pathological.
If what his niece, Mary, says is true - then it would appear that he was emotionally neglected by strict demanding parents in an environment where 'winning at all costs' was the family value. That could have made him feel very lonely as a youngster, and could explain why he's so temperamental, so 'needy' of admiration - and so spiteful when he doesn't get it, or when he's being held to account. Maybe he's never matured emotionally - and that is perhaps the fault of his parents?