Exactly this.
We are seeing Hillary's true self emerge. Yesterday's meltdown is the reason her handlers keep her locked away from the press. That's why she does only the most carefully scripted, brief, and controlled events.
She is not a politician. Her husband was the politician, and he radiated comfort and connected with people by projecting a (manufactured) likable persona. Hillary has only won a single election in her life, and that was riding on Bill's coattails with the deck stacked in her favor for the NY senate. She lost her first real fight for office against Obama in 2008. Hillary's nature is imperious, self-righteous, inauthentic, and witchy. People see her as unlikable, wooden, angry, and condescending. All of that came out yesterday and we will only see more of her venom as she cracks under the threat of failure from the physical/mental challenges she cannot withstand.
This country is sick of her and she just showed everyone why.