Mi Yuanzhang means "Tell everyone, I am not crazy, (let Su Dongpo be his witness)"
And Su Dongpo means "You are crazy." , do you need me to say it?"
Here Su Dongpo understood what Mi Yuanzhang meant, but deliberately said "I follow the crowd", which was a joke with Mi Yuanzhang
Mi Yuanzhang is Mi Fu Calligrapher
Su Dongpo is Su Shi
The original text is as follows
Dongpo was a guest in Weiyang one day, and Mi Yuanzhang was present. After half a drink, Yuan Zhang suddenly stood up and praised himself, saying: "Everyone in the world regards Fu as their top, I hope my son will look at it." Poe laughed and said: I follow the crowd