To summarize:

Melissa Bank wrote a chick lit novel.
Curtis Sittenfeld wrote a negative review in the NY Times.

Curtis Sittenfeld wrote a novel she says is literary fiction.
Jennifer Weiner didn't review it per se, but says it's chick lit. She describes it in the same derogatory terms Sittenfeld used about Bank's book. Implications:
(1) Sittenfeld is a hypocrite
(2) Sittenfeld's book is empty trash

Jennifer Weiner writes chick lit herself.

Weiner's line-by-line commentary on Sittenfeld's review is startlingly mean, putting words in Sittenfeld's mouth and portraying her as an insufferable, conceited ass.

Finally, Weiner concludes by saying meanness is not helping women get published or taken seriously as authors.

Cook utensil, meet cooking utensil.
What a sad and ridiculous display of bitchery from all sides.