I think what he was trying to say is that these actions aren't really related to misogyny at all since they are also directed towards men, but general human idiocy.
> Exactly. If something happens to both men and women, you need to do a lot more work (i.e., get data) to show misogyny.
This isn't really the case. Misogyny can be a part of actions or threats targeted against women even if men have received threats in similar circumstances. The question simply comes down to the content of the threat and how often women receive threats that explicitly call out their gender or use slurs that are intended to be used against women specifically.
I think it is generally agreed upon that white males can say things that others can't say without running into death threats. It is also generally agreed upon that women are more likely to be abused for saying things.
That being said, epistasis's reasoning is still wrong. A kind reading blames the difference on misogyny, suggesting the non-misogynists send death threats to males and females alike. But that would only be true if a large portion of the people that send death threats to females would do so out of misogyny and not out of, e.g., an unconscious perception of women as easier to troll. You may argue the reality of that perception and you may want to change that, but disagreeing with it doesn't make it misogyny. That's just labeling every bit of discriminatory behavior as 'misogyny', which comes down to redefining the term.
Apart from being wrong, I think it is unwise to use language so bluntly. It makes most readers think "well, I'm not a misogynist, so nothing here applies to me", when the real thought should be "yes, interesting, how likely am I to discriminate against women? Can I identify the possibly subtle effects that lead to this discrepancy?".