I think it depends who is using the term and in what context. I know plenty of feminist women who use the term SJW.
SJW is a term that I associate with condescending opportunists who don't legitimately believe in the social equality-oriented causes they purport to so much as they enjoy appearing to be more cultured and sophisticated than say people who lack a college degree and reporting people on the internet for disagreeing with them. An SJW, at least in my mind, can be identified by their frequent use of terms like "intersectionality" and "cisgender" like Jane Average knows what the hell you're talking about and condemnation of people who don't embrace politically correct lifestyles like veganism that ordinary working class people might not be able to afford.
AVERAGE PERSON: We need to support Planned Parenthood and other women's health providers...
Of course, I get called one too from time to time too, but it's always by guys with underdressed "waifu" and/or Pepe the Nazi frog avatars who use terms like "gynocentrism" in casual conversation and assume normal, rational people who follow credible news sources not only understand what that means but furthermore agree with them and also once used the #gamergate hashtag, so...you know, I recognize that any concept can be abused by people who are so far out there on the right that everyone looks like Stalin to them.
ME: I like Star Wars.
It seems all the more extreme groups try to set themself apart with a special language. if you need a dictionary to talk to one of these people, something is probably wrong. And even if they are well-intentioned… if you fail to communicate with normal persons your ideology will probably not win.