Aye, and that is most certainly a thing. I don't believe every report coming from butthurt Twitter users about rampant Donald Trump fans burning their cat, but I have no doubt this has emboldened some utter knob-ends. I can't imagine it will be anything other than a short-term phenomenon. That's still pretty grim, I know, but once America has stopped wobbling from this result it will be business as usual
That depends on Trump supporter seeing improvement, and Trump himself having no obstacles.
Because say the USA enter a depression - it's so easy to go back to the well and blame immigrants for it, or blame China, become isolationist, scapegoat foreigners in general and so on.
Once you've established a pattern of blaming a largely imaginary scapegoat for all your problems, you can do so time and time again. To see parallels with Germany again, see the Great Depression and how the NSDAP capitalised from it.
But the thing is, even if things go well, it actually legitimises the politics even further (like the total war economy resulting in Nazi popularity due to high employment, the building of the autobahns and so on).
So it all comes down to what Trump does next. Is he content to play normal politics now? If so, things will subside. But if he's determined to play popularity politics by blaming when things go wrong etc. then the trouble will be long term.