Rebecca Solnit at Literary Hub:
1) Do not read the whole original post or what it links to, which will dilute the purity of your response and reduce your chances of rebuking the poster for not mentioning anything they might’ve mentioned/written a book on/devoted their life to. Listening/reading delays your reaction time, and as with other sports, speed is of the essence.
2) All of the O.P.’s feelings, experiences, interpretations, and values should be in the first sentence anyway. Only fascists hide those things in militarized outposts throughout the terrain of the piece. Which are basically ambushes. Which is violent and elitist.
3) If O.P. points out that your critique is baseless/ wrong/ high on its own fumes, whataboutism is your friend here. Just levy another charge, however unrelated. After all, any statement can be condemned for not including all other statements, aka O.P.’s concern about saving the whales is only a sign of his/her/their indifference about some other issue or cetacean or mammal or cause. There is always something.
More here.