Melissa lays it out here, noting:
[O]ne of the most common themes among the emails I get is gratitude for expressing frustration or contempt or anger at something of which, women have been told in explicit or implicit ways, our jovial and uncomplaining acquiesce is expected. Thank you for saying it’s not funny. That something has always bothered me. It’s an expression of relief that someone has said publicly what they’ve felt privately:and maybe never said to anyone for fear of reprisal, for fear of being told they are humorless, hypersensitive, over-reactionary, boring.
