I think it is really beginning to  bother a lot of liberals that Trump doesn't engage in 'false humility'. That's always has been a sham that politicians and others in society have 'overused' and resort to as a 'default' act. "When nothing else works, use humility."   
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 Most of the people Trump does meet with are impressed with his  genuine humility.  I hear about  this, particularly in his hospital visits. People 'felt' his humility.  More than one person was impressed by a sense that he truly cared.  You can't fake that with all the  'full tooth grins'  in the world. It's either there, or it isn't.
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 I think with Trump, the humility is real and the braggadocio is put on, whereas with many politicians its completely opposite. The humility is a 'put on.'