It may be that Trump has serious issues with self esteem.

The need for self-aggrandizement including the inability to tolerate criticism, the need to be loud and brash,  the lying and exaggeration, the secession of "trophy" wives, and the general vulgarity of his surroundings and lifestyle all might be indications of such a problem                        . 

It is particularly noticeable when he reacts to the most trivial of criticisms which would be best ignored thus often giving them unneeded credence.