Regarding the OP. Who was it that said that people judge other people not for what those other people are, but rather for what they are themselves?
The GOP is behind Trump mainly because it makes a point of a) opposing the Dems out of some sort of blind, proud principle; and b) mustering power if at all possible. And because it does so, it wants to believe that there is a mirror image behavior from the Dems. Even when that makes no sense.
While both parties have some variation on positions (GOP considerably less then Dems, far as I can see, but still), the bottom line is that issues such as taxes for the wealthy, social assistance and public health policies and gun control are pretty good predictors of how the two parties align themselves.
The Republican Party made a point for a decade or so of stopping just short of declaring that any Democrat in a position of influence should be treated as a boogeyman to oppose at every turn and insult whenever possible, logic and decency be darned.
It does not get to blame the Dems for that now.