WHy do you care about this? EVERYONE should grok by now, that Trump has an odd and somewhat off putting style.
I care about this because I'm fascinated by the psychology, motivations & behaviors of partisanship and its effects.
That is, by far, my biggest interest in this message board.
So my interest in this thread is not about Trump nearly as much as it is about his fans.
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Trump uses hyperbole a lot. His supporters know that, and consider it when he says something like "greatest economy ever", ie we don't take it literally or even seriously. It's meaningless bluster.
I'm not sure there is much psychology or deep motivations to be gleaned from that. At MOST a little in group bias.
Do you really see anything more there? If so, I would recommend that you consider YOUR "motivation",
And I do NOT mean that as a partisan dig or a gotcha. So, please don't dismiss it as such.