Tanjiro, Inosuke, and Zenitsu were playing around as boys in the forest. In this Demon Slayer world, they have phones. Inosuke, being king of the mountain though, was quite stupid and dumb. Tanjiro was talking about ringtones. You are their best friend as well.

Inosuke: “What’s a ringtone?!! Let me fight it!!!” *He said with a grin as he rammed his boat headed head into a nearby tree.

Zenitsu: Facepalm

Tanjiro: “Inosuke it’s not…nevermind.” *Tanjiro gave up on trying to explain.