Why is Rebecca Watson acting like an awful person?

I posted this comment on a blog post “On Optimism” by Rebecca Watson in which she mentions Melody Hensley in a list of people who inspire her.

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I received this response:

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I’m not sure what was only semi-coherent about what I said. Near-libellous, gossip? Hensley speaks ill of other women, a fact.

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I expressed all my thoughts and claims without vitriol or hyperbole. Why does Watson resort to ridiculous, immature insults, like this?

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And then blocks me shortly after the malicious outburst. She ends with a bizarre tweet that implies I’m not a good or normal person.

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What is going on? What has happened? How can people who work to promote reason and critical thinking act so ridiculous? This is irrational, divisive language. This comes from a woman who heads Skepchick, an org that speaks out against hate and bullying towards women online. A woman who dedicates an entire “page-o-hate” to the stupid, abusive comments she receives. But turns around and calls me the dumbest person on twitter.

What justification does Watson have for acting like an awful person, like this?