Keep in mind that in Japanese, they don't really have curse words in the same way that English or other languages do. Most of the cursing you see targeted toward people that's been translated is actually just them speaking in a rude way that's hard to translate into English without curse words. For example, one you often hear in anime is "kisama" which is often translated as "bastard," but it's actually just a rude way of saying "you." It gets translated as bastard in English because we don't really have different ways of referring to people based on formality like they have in Japanese. The most we have really is if you want to sound "noble" you use older/bigger words or if you want to sound more professional you avoid using "can't" and use "cannot" instead. If you listen closely you can also hear a lot of the time that when the subtitles say "bitch" the character actually just said "Onna," which means "woman," in a rude sounding voice. It gets translated as bitch from the context to make it make more sense to an English speaker (Think 4KIDS Dub of Pokemon calling a Rice Ball with a pickled plum a "Jelly Donut" since most American kids wouldn't know what a rice ball was). I mean, they have words that can be taken as insults obviously. Like, they have a word for whore, which just refers to women that work in brothels as a name for a job when that was a thing that was legal. That word is obviously offensive to a women who does not work in a brothel though, so it can be used as an insult but is not necessarily a curse word in the same way as calling someone a bitch in English. I haven't seen the raws, but I assume he's just saying "onna" or "mezu" (which is the closest approximation to bitch since it means female as in the sex of an animal rather than a human woman).
TLDR: He's not technically calling her a bitch. He's just calling her "woman" in a rude way. Thus, wholesomeness is kept. Sorry for the lecture lol.
this really isnt that good the art carried the story. sorry, but you just cant call a woman a bitch