What a weird conversation I just read. This is a visual novel. If it didn't have conflict and controversy and characters with complex motivations, it would be boring. I can't believe how personally some people take these things.
Jack is our hero. He is also a mentally broken borderline psycho who has killed or paralyzed tons of people, just in the past week, both men and women. If you find out that someone you just met is killing people all over the place, you aren't going to trust him easily. And if your "little sister" has fallen head over heels in love with that guy, you would be scared as hell for her. And no, you wouldn't just back off and wait to see what happens. And it sure as hell doesn't mean she is " being a bitch for no reason." She has really, really good reasons, but she responded excessively. Well so what? Everything in this VN is excessively and over the top. Heck, Jack just delivered a severed hand on a plates to someone. I just don't know why this plot device pisses off some people so much.