No he actually just want him to shut the fuck up
But to actually train himself into being able to discern whose inner voice is whose in a crowded area is scary. HOW is he planning to shut him up? That's some scary dedication. Very one track mind.
It's established in one of the earlier chapter that he does have one track mind and how he will shut him up, idk if he thought about it that far. It was not said in any chapter but shutting him up is in one of the earlier textbox
I am a little worried about Mr. Mind Reader honing his skills so he can zero in on our MC. He is giving crazy psycho vibes.