Michizo was just arguing with Gin Akutagawa, actually it's not even clear what happened that they were arguing, but both of them continued to argue just to make annoy each other. Tachihara had never really been careful with his words, especially as a spy in the Port Mafia. Who as a mafioso would be careful with his words?

Soon Hirotsu separated the two of them, the old man was definitely fed up with their bickering, and Tachihara only nodded, still annoyed.