I'm not a Yank nor do I vote or care to ever vote, but if I were and all I ever saw was every mainstream source of news and media, including sites like Reddit and apparently even HN, calling me a retard (which funnily enough is a pretty bigoted insult coming from the supposed moral & good side) and a bigot non-stop I'd probably say "fuck it" and vote for the guy too.
From where I'm sitting across the pond, the Republicans want stricter border control, smaller government, lower taxes, free speech (which itself is a loaded term that means different things depending on who's saying/hearing it), which is basically what the populist parties across the EU are promising as well.