I think it started with “This Car Brakes For Animals” and “Baby On Board” back in the early- to mid-70s.
That’s just my personal observation. Virtue signaling may have started before that. I suppose you could say that wearing a Crucifix pin or necklace is virtue signalling too.
“I think it started with This Car Brakes For Animals and Baby On Board back in the early- to mid-70s.”
Who knew that, in retrospect, the “Gas, Grass, or Ass, Nobody Rides For Free” stickers were a veritable Conservative manifesto?