It didn't start with Trump.
where did it start? can you name this kind of vitriol with any other campaign? no. it did start with trump. because trump appealed to the right wingers the GOP let into the big tent, the bigots, the ones who called obama a muslim, if they were polite. the ones who hated a black man being president, and hated his wife and made up the most bigoted racist memes and insults towards them, the ones who the GOP mainstream let in because it helped them win some elections in backward redneck states that condoned or even enjoyed that hateful racist, bigoted bullshit. the whole birther shit trump championed was really a way of saying obama is not really an American, his dad was from africa, maybe even a muslim!! obama has to be muslim, too!! if jeb bush had won it would have been a typical contest. if kashich had won. but the vast hordes of bigots that pretty much took over the GOP after 2010 or so, were into trump- he spewed the same awful shit they did. he knew mexicans were animals, killers and rapists here to take away our jobs. he knew muslims were here only to change all our laws to sharia and blow up army compounds and take away all our jobs. and blacks. and jews. and anybody who ever criticized the USA was one of them, and every democrat wanted to murder babies.
that is what the GOP is all about today. read the posts here if you don't believe it.