a term that started as a fairly literal description of someone fighting for social justice and eventually turned into an internet insult.
by the 2010s, especially around online culture wars, “sjw” became shorthand for someone seen as overly performative, moralizing, or obsessed with identity politics. dictionary sources now label the term as disparaging in common usage.
the sociological part is more interesting than the insult itself.
take a college student who cares about racism, sexism, or lgbt rights. activism can start as genuine concern, but once that activism moves onto social media, it also becomes visible to an audience. now there are likes, reposts, status, group approval, and punishment for saying the wrong thing.
at that point, you are not only expressing a belief.
you are also performing membership in a group.
that does not automatically make the belief fake. humans have always signaled values through religion, clothing, rituals, politics, and community behavior.
social media just gave moral signaling a scoreboard.
that is probably why “sjw” became such a loaded term in the u.s. it stopped describing what someone believed and started describing how other people thought they were performing those beliefs.