If Trump said the sky was blue, suddenly it would have to be red and if you were a red sky denier you were a racist. We are still dealing with the echoes of this and will be for at least five years.
This is why having a super-polarizing troll in office is inherently bad for society. I think that's true regardless of their stripes. An obnoxious troll from the "left" would be no better in this particular regard.
There's a reason high office leaders need to carry themselves professionally. Class (of the behavioral sort) is not some old fogie cultural superstition. Leaders that carry themselves like Trump actually damage the cognition of the people in their society.