Her piece is entitled, "Fellow Liberals, Let's Stop Doing These Things". Her piece is about the bad, degrading tone afflicting not just (what passes for) discourse between left and right, but discourse between ostensibly likeminded folks on the left. She has a short list of "hideous behaviors" that seem to be prevalent, having become almost reflexive.
The list of things wrong with the country and what passes for our current national discussion is long. Lithwick has taken a stab at enumerating some of the most egregious items, and for that, I'm grateful.