For me, I really like to stress that "SJWs" are often a loud minority.
Best case scenario -- they're people who do fight for social justice but are very fanatic and radial (which, ironically, doesn't provide a lot of progress).
Worst case scenario -- they're people who claim to be for the good of others, but they're just as prejudice and mean as any outwardly racist person. It's why we've had, for example, people claim "transwomen aren't women" and thus couldn't be active for women's rights.
They like to be a loud minority, and we ALL know how the loud minority like to speak for everyone. Hence, when someone actually is justifiably worried about a situation that is indeed injust, they get hit with the "SJW" label because again -- loud minority decided to represent everyone.
Honestly -- Social Justice as a whole is to try and better the world for not only yourself but also those around you. It is very valid and still needs to happen today, and no number of SJWs or prejudice people will change that for me. But, as we've seen in history, you will have radicals who can make that harder for others to do so. I can tell you, there were plenty of SJWs back in the hay-days of Women's Liberation, Civil Rights, LGBTQ+ Rights, and other important movements. We just decided to have a name for them in the current era.
Now have I met one? Yes -- in person and on the internets. And lemme tell you, it's..something. But again -- I'm also a person who likes to read up on my history, so I know enough that not everyone fighting for a cause is like this.