It’s not a “mistake” if it’s true. And ThinkProgress did a pretty good job of showing a clear correlation between supporting Trump and being a bigot.
She has an opinion. These are the facts.thinkprogress.org
Not exactly a surprise, because Trump got his popularity by pandering to bigotry, and built his campaign on it. The fact that Trump got the nomination means there are enough bigots in the party to give it to him.
As far as bigotry being “deplorable” — I admit that’s a matter of opinion. My opinion is that bigotry is deplorable. Apparently, so is Hillary’s. Your opinion may differ.