The only reason this isn't quite as devoid of meaning in ordinary use as "fascist" is that the people that use it as a pejorative are loudly signaling which tribal clique they affiliate with. I know I probably shouldn't interrupt them when making a mistake, but they probably won't listen to me in any case.
So, here's the thing. The people that think Social Justice Warrior is actually an objective term complain that SJWs are forcing "Political Correctness" upon them.
For them, those that criticize those that call same sex affection a "sexual aberration" are intolerant, but calling it a sexual aberration is just free speech.
"Homosexuals are deviants" is an actual political view. It's free country, and I will defend to the death your right to say it, but you are wrong. And if you start flailing about with "Help, help, I'm being oppressed by the SJWs", you are just doubling down on your wrong.