Trump is one of those that draws strong feelings - positive and negative. If you like Trump, you really like him. If you dislike him, you really have thing against him. The Republican Party most often has opted for milk toast in their candidates. So this is something that is not the norm at all for Republicans - you have to literally go back to Reagan to find these reactions. And I am old enough to remember, Reagan was hated with true vitriol by those within the Republican Party that hated him. And those that hated him were the true kingpins of the day - people like George HW Bush, John Anderson, Gerald Ford and Nelson Rockefeller. This all gets lost over time, but the pronounced bad feelings you are seeing within the party, were there with the Reagan insurrection of 1976 and then the takeover in 1980.
Those kind of feelings are back in 2016 with Trump. What I find very funny is that even the "hated" Ted Cruz, a man truly despised by the party establishment, is being spoken of now in terms of "principled conservative" by people within the establishment who would have spit is name out with vitriol before Trump came around to suck all the air out of the room. I find it hilarious that they are trying to co-opt Cruz now as the principled alternative to Trump. They hate his guts! Which shows how hard their feelings are about the Trump insurrection.