London UK: this carriage is for vaccinated people only

I believe this was intended as a social commentary. The question is when does it just help normalize.

A concept of poe's proximity. If satire and insanity end up near one another, when doing satire in an insane society, you might push the envelop just slightly outside of the current insanity and it may look attractive to the insane.

Real social commentary would be removing all signs that mention covid or show someone in a mask. Start forcing normality.