For about 37 minutes in the Batman v Superman movie, one set of clothes should be Batman's uniform. It says "You are a joke". Who wrote it?

The person who wrote this word is a clown.

To correct, the owner of that suit is not Batman, but the second generation Robin jason todd. In the cartoon, the second generation Robin was unruly and very impulsive, and was finally killed by a clown. Batman witnessed Robin's death like a son after his parents died. The death of the second generation Robin was a heavy blow to Batman, so later Batman's performance-as shown in the movie-became darker and more stubborn, and he began to attack criminals.

BVS's worldview is more like the scene in The Return of the Dark Knight. Without the third generation robin, Batman may not have cultivated a new robin after the death of the second generation robin.