I think sexism was certainly an issue...starting with Hillary's non traditional First Lady of Arkansas, to the White House to the Senate to State...folks who are not happy with competent women (see uppity)  are threatened....

I saw data on the "change" issue which is why I mentioned it...no argument about racism, antisemitism and xenophobia....

But having had some access to political campaigns I know that where you place your assets, i.e., staff... media buys etc is also an issue and it's my opinion that the Clinton folks operated on some very poor assumptions about that blue line, the Obama history...et al particularly in those three states that could so easily have shifted the other way with better strategy...the differentials were around 100,000 votes ...11 here, 20 there and 60 plus in Michigan....

You can call it hubris or arrogance or just bad judgement...but a huge mistake it was...and a terribly high price for the US and the world....