To me, it’s like the sound of a knife on china. Or fingernails on a chalkboard (if anyone remembers what a chalkboard is).

 
However, you can talk to a Japanese girl and let her know what you like and don’t like. If she speaks English well enough.

Rodney: "I went to the doctor and said: Doc, it hurts when I do this (lifts arm up)."
Doctor:  "So don't do that."

 
If the J-Girl's noises make you "un-aroused," tell her not to do that.  Don't overthink it.

 
You also seem to be saying that the "sounds of pain/crying" are being faked as they are in Japanese porn because the J-girl thinks that's what the customer expects.  How do you know that K-girls are not faking their moans and sounds of ecstacy because "they think that their male partner expects this and will be aroused by it."

 
There's a famous scene in "Klute" where Jane Fonda, playing a prostitute, is screaming with pleasure and telling her client how great he's fucking her while at the same time checking her watch behind his back.

 
The next time you go to see a Kgirl...see if she's wearing a watch.

I’m sure k- girls do often fake sounds of ecstasy, just like many providers do.  I’m saying I find it odd that with j-girls they instead fake sounds of discomfort.

It bothered me from the start, and ever since I say something the second they start. Now, I don't want them to take my request too far and show on their faces that I'm #10 for the day and they'd like to turn down the covers and go to sleep. But moaning and squealing and what have you? I'm with you, no thanks.

the strange noises than having them ask every three minutes if you're finished yet.  Lol

currently in my rotation likes to exaggerate her moaning, screaming and  oh baby's!  What she is doing is making fun of the girls that do it for real! She has a good sense of humor, she'll also go over the top with head and arm movements! The other day I through it back at her and it took her a second to pick up on what I was doing! We both had a laugh at that!

If you plan on seeing her again, just ask her to act normal (unless that is her normal). Most J-girls you’d bone IRL do not mimic this behavior. As others have pointed out, in Japan, customers (who are usually J-porn veiwers) expect that behavior but working here she should know to turn it on or off as desired by the customer. In my years in Japan, I never hooked up with a chick who did that shit. The girls who dated gaijin knew we weren’t into it so no blood curdling cries and screams (unless she was cumming hard as fuck). If you see her again Im sure she’ll be willing to accommodate you.

Had same experience with the noises during session with J girl. Tried to communicate my displeasure. Unfortunately only communication was with translator app on phone. Sadly my go to k-girl agency went dark after covid. Much rather have the girl fake pleasure than pain!