Social justice warrior
Social justice warrior (SJW) is a pejorative term used for an individual who promotes socially progressive, left-wing and liberal views, including feminism, civil rights, gay and transgender rights, identity politics and multiculturalism. The accusation that somebody is an SJW carries implications that they are pursuing personal validation rather than any deep-seated conviction, and engaging in disingenuous arguments.
The phrase originated in the late 20th century as a neutral or positive term for people engaged in social justice activism. In 2011, when the term first appeared on Twitter, it changed from a primarily positive term to an overwhelmingly negative one. During the Gamergate controversy, the term was adopted by what would become the alt-right, and the negative connotations gained increased usage which overshadowed its origins.