That's a very obvious strawman. If you downsize it to the level that GP alluded to, asking if Trump's voters are jerks because they voted him into power, I guess a non-negligible amount of people would agree.
Those "some people" must number more than 1%, right? It is almost impossible to win a non-trivial number of seats in the election if only 1% of the people support you.
30% of Americans even today support Trump. So one would be right to claim that 30% of Americans are jerks.
Absolutely, yes. You can go visit the heartland or the rust belt or whatever and people are friendly and polite and welcoming in person, but they voted for Trump so they're jerks. They support xenophobia, homophobia, torture, corruption. There's a difference between being nice and being good.