It's really the other way around. He's been insulted and accused of everything and anything others could think of.
Did you follow his campaign from the beginning? Did you listen to what he said? What he's still saying?
He got millions of dollars worth of free press, which many independents don't get, and that probably explains why he was nominated. He got the media exposure that he wanted.
But, fame costs, and he started paying it when it came to a national election where his divisive and right wing (I wouldn't say policies) positioning doesn't convice many in the middle.
He also doesn't convince anyone with any critical thinking that he actually has any realistic policies. In social terms, despite the publicity, his proposals are behind Clinton's, but that's OK for his right wing core supporters.
He also can't cut taxes and hand out money, even if more businesses do relocate to the US. I don't know if they will. Or produce enough to export.
Regarding polls, the similar can be said of those from left wing as for right wing media.
Which is why I asked about Trump's own polls. He looks defeated, not someone who knows he's going to win. His own polls must be giving him a bleak picture.
Not the national overall vote, that's almost irrelevant, but the all important swing states. He has a mountain to climb.