Some things I've been thinking about:
The extent of Laura's socialization as a child was brutal beatings, outright torture, and virtual isolation aimed specifically to leave her as emotionally stunted as possible. This is a case where I would argue her background is a justifiable excuse for her adult behavior, because any child who experienced the level of abuse Laura was subjected to would have been dead in real life. We have literally no precedent for just how badly what the Facility did to her would screw someone's development up since there's no one who would have actually survived it.
It's frankly a miracle Laura ended up able to function at all.
Now, I wish Marvel would actually acknowledge this. Honestly, in hindsight that's the one thing Hopeless did with her that I think works: The notion that whatever progress she's made, Laura is consciously projecting a false front that she's doing better than she actually is.
So the act isn't that Laura is a "mean girl" pretending she's not. It's that Laura is pretending she's mentally and emotionally healthier than she actually is. She's doing it because she feels she's "expected" to be better, when she's really deeply and fundamentally fucked up and struggling. She's no longer teetering on the edge of a total emotional collapse, but she's not a well person.
Such treatment by Surge is, IMO, only justifiable based on the surface impression, and the fact Laura doesn't let anyone know that she's barely holding it together. Not even Logan and Gabby get to see this, and in fact I think it's dubious they would even truly understand; Much of Logan's worst trauma came later in life, and Gabby was actively shielded by the other Sisters to protect her from Alchemax's abuse. Even Akihiro, as hard as his childhood was, can't compare to what Laura experienced.
The only two people that come to mind who could possibly relate to her are Bellona and Fantomex. Both of whom are very, very messed-up, albeit in quite different ways.
This kind of ties back to comments you've made before about wanting Laura to be allowed to be "weird" again. which is honestly kind of what you actually have. But it's not the amusing sort of weird of Laura making innocently offensive comments or strange behaviors because she doesn't know better. Instead it's manifesting in a very realistic manner; her personal relationships are a mess because she's emotionally incapable of forming and maintaining normal attachments. NYX #8 highlights this in its retcon of what happened during the Babysitting Arc, with Laura being incapable of recognizing that Julian was actually hurting and in need of help, and not that she was ruining him by her influence (or, more recently, that he was acting of his own volition and not being controlled by Empath).
Thinking about it more, I don't know that Laura does need to eat crow or be called out to fix her relationships with others. What she really needs to do is be honest and admit that she's not doing as well as she's tried to present (IMO they should also lean into her resurrection and the whole Talon business contributing by shattering her sense of self). She's still very messed up and floundering, but doesn't even know how to express it because she feels pressured to be seen as healthy because expectations and stigma. I think Schultz tried to hint at this with some of Laura's narration, but it ultimately didn't come across effectively.
Also, Xarus is kind of an unfair example to use considering Laura has very real reasons to be suspicious of him. Even by the sliding time scale his Face Turn was extremely recent, she not that long ago had to deal with his son making his and Dazzler's breakup everyone's problem, (with Xarus callously ordering Alex to dispose of them) and I would assume she'd know that Xarus was the one who turned Jubilee in the first place.