Excerpts from a Twitter argument among progressives:

I will not support white male candidates in the Dem primary. Unless you slept thru midterms, women were our most successful candidate. Biggest Dem vote getters in history: Obama ‘08, Hillary ‘16. White male is not where our party is at, and is our LEAST safe option in 2020.

— Amy Siskind ????️‍???? (@Amy_Siskind) December 17, 2018

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isn’t there something not progressive about pre-emptively dismissing a candidate based on their race and gender? I feel like there’s as word to describe that…as a progressive, I won’t be jumping on board with that idea.

— David Pakman (@dpakman) December 18, 2018

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that’s exactly right, and I’m 100% onboard with that. It seems to be the exact opposite of pre-emptively disqualifying candidates on the basis of race or gender.

— David Pakman (@dpakman) December 19, 2018

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It’s remarkable that you felt so threatened by a woman saying she will vote for a woman in the 2020 primary -that a woman would have her agency and the right to have a voice to express her opinion – that you felt a need to make a thread of it. Remarkable. https://t.co/wktcySgI14

— Amy Siskind ????️‍???? (@Amy_Siskind) December 19, 2018

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2 days ago @Amy_Siskind posted that she won’t vote for white or male candidates in 2020. I pointed out this is racist and sexist. Yesterday she blocked me on Twitter. Today she called Boston College demanding they not have me back as adjunct faculty.

— David Pakman (@dpakman) December 20, 2018

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Amy Siskind is a feminist activist and former Wall Streeter.  And on evidence of her tweets, she’s an angry bigot — but a bigot for the left, so, as Alvy Singer says, it’s all good.
It is by-the-book for progressives to try to destroy people whose arguments they dislike. Even other progressives.