I would just like to note / point out that "SJW" is not a particularly neutral way to refer to the group of people in question -- it smuggles in (at least for some readers, and I suspect for most) a distinctly negative connotation about the group described.

Obviously if that's your intention, then by all means use the language you prefer; but if some of the commenters didn't mean it that way, and are just trying neutrally discuss a movement, I'd encourage picking a different term for it. (I normally say "the social justice movement".)

I will borrow from Error's very apt disclaimer in another comment, and note that my feelings toward the movement in question are more or less neutral -- "an affect borne of opinions that cancel out rather than a simple lack of same."