Safe prediction: Trump wins 2020 and his detractors spend another 4 years using politics as an excuse to harangue anyone they don't like.
Trump is not to blame for this. It could be Trump. It could be Romney. It could be Ben Shapiro or his clone Shen Bapiro. It would make no difference. If the candidate isn't theirs, they will use it as a pretense to seethe against the supporters. With Obama, it was viewed as pretty unreasonable even within conservative circles to attack anyone who was an Obama supporter. The man himself? Fair game, but I don't recall such a sustained and hateful campaign against anyone who voted for him, anyone who happened to work with the president.