I think in the writing they're very careful to soften the edges of the harsher words coming out of his mouth. But you know, the other thing is the way that the other characters are reacting to him.

我塑造这个角色时，和我塑造其他角色一样，都是尽可能地使人物鲜活 如果要用这个词的话，如果那听起来不是太做作的话。

youdao

Koetsu's sources reached back hundreds of years, and yet his way of writing "fat and thin" characters, some bold and emphatic and others trailing to the faintest visual whisper, was peculiarly his own (at least among Japanese calligraphers) and difficult to emulate.

CNN: ASIANOW - TIME Asia | The Subtle Magic of Koetsu