Thanks to finding a Reddit squabble in my referrers, I have now witnessed the phrase “Enjoy your rainbow-colored SJW hair” used as an angry retort.
Never in my life have I seen “rainbow-colored hair” conceptualized as a derogatory trait to assign someone you want to insult.
At least, given the context, I can only assume it was supposed to be an insult…
Who knows. Maybe on Reddit, “enjoy your hair” is a normal phrase for farewells and greetings.