I remember having a conversation with someone around a decade ago about whether "social justice warrior" pointed at anything real. My contention was that every popular moral system has its prigs and its fanatics - social justice no less than Christianity, environmentalism, socialism, etc, etc, etc.
Every decade has its new leftest boogeyman for the right to complain about, same as always. Critical Race Theory, Political Correctness, Hippies, Civil Rights Crusaders, etc... Doesn't really matter, just so long as it is an "other" that can be ostracized as a group.