The hatred of Hillary was greater than the hatred of Trump, at that point. He still barely won with a historically low vote %. Hey I was a big supporter of him at the time. But probably more because I didn't want Hillary in, like millions of others.
But at this point, Trump is the new Hillary. Someone that people are sick of, but who still feels they are entitled to the Presidency.
None of this explains why Trump was ever nominated in the first place.
I can tell you exactly why he was nominated. Tens of millions of Americans woke up one day in 2015, took a brief look at the news reports about the 2016 presidential campaign, and realized (in utter disgust) that in a nation of 300+ million people, the two frontrunners in the presidential election were a pair of @ssholes named Bush and Clinton.
Among those tens of millions of Americans, the Republican ones decided to do something about it. Democrats, on the other hand, don't have the intelligence or wisdom to do anything except whatever they're told to do.
lol Gotta give this a lol because it struck my funny bone. This is a good estimation of the state of things regarding Trump. It ain’t popular but I’m sympathetic and in agreement to your point.