Because he's a child 
It's not just 'Rocket Man.' Trump has long history of nicknaming his foes https://usat.ly/2ygaiS6 via @jmestepa
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And a long history of being seen as an a**hat, but somehow that doesn't seem to deter or slow him down
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Ooooh nicknames, lessee..tiny hands, orange man, orange mop top, trump the chump,swamp man,liar-in-chief,captain misogyny,serial assaulter..
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Tiny Dancer?
End of conversation
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