This is from the New York Times in 1934.
There are quite a few of these things being shared on social media at the moment, including old articles urging black people to be civil to people who want to keep them segregated, and more recent articles urging LGBT people to be nice to howling bigots.
The sharing is in response to a non-story about Trump henchwoman Sarah Sanders, spokesperson for a vicious, intolerant, authoritarian regime, being politely refused service in a restaurant: some of the staff are LGBT and didn’t want to serve an apologist for the ban on trans people in the military.
Naturally, the right-wing press have engaged in a bad-faith argument about the supposed intolerance of the left – people who, the last time I checked, weren’t caging children and attempting to return the world to the glory days of the 1930s. That’s all okay. Politely saying “you’re not welcome here”, on the other hand…
This is based on Karl Popper’s writing from 1945.
Trump fans are protesting outside the restaurant. This image is from ABC News.
The signs being held by the people demanding civility say “Homos are full of demons” and “Unless they repent, let God burn them”.