Thing is, AFAIK, Julia doesn't know about all that, since Vika is communicating to us via text. The only thing that can be construed as disrespectful to MC would be Vika putting Julia in these embarrassing situations (like pulling her towel, or leading guys to her changing room), but since Vika isn't overtly talking shit about MC to her, then Julia just writes all of that off as playful.
Don't read too much into it, it's supposed to be a bit more on the nose than real life. Especially since Julia is clearly growing more comfortable with the idea of taking other lovers (on her husband's suggestion, no less), so give the girls a break.
No..., if she is this disrespectful to us, she was that way before and Julia would know... and if not, then her 180 shift and disrespectful behaviour would make anyone sensible talk to Julia about it...
She is annoying as fuck, every of her parts makes me wanna quit the game, which is sad, because I like the other parts. Writers need to finally understand that you don't need a "cunt best friend" for it to work. NTR route needs "corruption"? Well, there are a bunch of guys, the ones she is supposed to cheat with then anyway, it makes sense to let them be the more "negative" influences" and for NTS, a good meaning, respectful and just kinky best friend works the same... honestly, works MUCH better...
I mean, if it was only on the NTR path, okay... but even if I stick to the NTS choices and encourage Julia I am still forced into the disrespectful conversations with Vika... well, it is only my opinion, the game dev may do whatever they want, it is their vision, but I will keep a look at it for another 2 or 3 updates and if I keep getting annoyed because I am forced to communicate with a disrespectful cunt that pretends to be my characters SOs friend just stop playing. *shrug*