You might want to check where you're standing. SJW is common slang, used by the right, the center, independents, and the moderate left to describe a particular subset of the far left. As an anecdote, a girl I recently met told me (unsolicited, I hadn't use the word yet, but we were talking around politics) "I'm fairly liberal but I can't stand SJWs." Ironically, you did in your comment exactly what you said the parent was doing - inadvertently demonstrated that your views are very far from the mainstream in a way that harms your own credibility.