Exactly what Bo said. But you can see from other data given in the video that it was uneducated white voters, and poor people.
Now i have to guess, because we don't have the data, but my assumption is that poor white people voted for trump and poor people of colour didn't. But it has already been said, all the poor people feel left out by the economic failure of the end of Bush, and Obama didn't give them the recovery and hope they voted him in for.
Sander's campaign was tapping into the very same sense of dissatisfaction, and he probably would have beaten Trump. And all of those polling numbers fail to address two pretty important things.
1st) how did voter turnout differ between the two elections. Did fewer people of colour turnout to vote? Was that a signifigant change (ie not having more actual votes from PoC while thise votes that did go to Trump made a larger %)?
We don't know. At all.
And 2nd) Electoral college. It doesn't matter what you voted for in Blue or Red states, the popular vote was won by Clinton, remember (or at least ~48% of it)? And it was the electoral college that elected Trump; so you actually want to look at the states which flipped from Obama in 2012 to Trump in 2016. An only those states. Then try to take into account the voter turnout there. Then see where the swings were...
This video does none of the necessary analysis. White males remain the only group which overwhelmingly voted for Trump.
And as has already been states. They were and are annoyed that 'free market' neo-liberal/conservative policies have left them to be fucked by co petition from workers in China/India.
Trump campaigned against those policies (though i've yet to see him mention a wall) Against the idea of free and fair competition across the globe, and in favour of the idea that 'our' people are the best.
Against equality (for women, people of colour, and QUILT BAG) and that is why people think he is a rascist, misogynistic, homophobe.