Clinton depicted Trump as the rogue politician he is, one who qualitatively differs from all previous GOP nominees. Rogues (whether states or individuals) operate outside accepted norms or principles. This makes them seductive to some, even as they are a threat to most.
I’ve seen a lot of people try to deny that Donald Trump is a racist and a few posts floating around on Facebook about how the Republican party is the party of Lincoln so it (and Trump) can’t be racist. But let’s face it, Trump has a long history of making racist remarks and the GOP platform is, to say the very least, extreme and is full of anti-LGBTQ, misogynistic, and racist policy recommendations. The alt-right are just a bunch of white assholes and they’ve successfully taken over the GOP.