The blue avatars on this forum as the most easily impressed people in the world.
It was a typical Trump speech, didn't impress or make an impact on any nation at the UNGA. They expected him to be this way. Though he does need to get a better vocabulary and his use of "Rocket Man" was extremely embarrassing. It was a solid C+
His use of nicknames isn't to appear dumb but to catch headlines. It's actually really smart even if it wasn't the most PC thing to say. He knows that CNN or whoever will lead with it and cut to more of the speech thus accomplishing more viewers. The speech wasn't all that bad on the whole, anyway, and I wasn't a Trump voter or supporter.
Because p*ssing off a madman, who is in possession of a hydrogen bomb, in order to catch the attention of CNN is such a smart and witty tactic.