I think Hillary is pissed because her whole life she's been studying how to be the president and then at the last minute the teacher (us) switched it up and gave her a test on the electoral college and she didn't study for that (or visit states that would have made a difference). And she REALLY feels jilted. She said so herself that despite all the negative things that had happened she was still sure she was going to win. She hadn't even considered the possibility that she might loose, even though every election, someone looses.
"Lose", "Loses" Sorry, just bugging me... (and yeah, I make my own mistakes as well)
Regarding Hillary's "I take responsibility for every decision I made, but that's not why I lost", I get it. Not eloquently said, but I get it. Her assertion, wrong on not, is that outside meddling from Russia and others is what flipped the election. I don't necessarily agree with that, and I do agree that her hubris gets in the way of her thinking clearly on it, especially as recent as the events were.
But I look at this one kind of like a look at Trump's "Covfefe" tweet. Yeah, it's fun to poke him with, but honestly it's just a typo late at night that he missed. I'll pay more attention to the actual message he was trying to convey and judge on that. My issue with "Covfefe" is not tweet or the lack of auto-correct. It's that Trump won't simply admit that. Instead, we get Spicer saying that Trump meant to tweet that, and there are a select few that know what it means. Even though he tweeted to the masses, and did nothing but confuse everyone and open himself to ridicule for no reason.
And that is also the issue with Hillary here. Not the quote itself, but the unwillingness to look beyond the emotion and be candid with herself and her followers as to her shortcomings. Trump, obviously, has that same affliction in spades.