I think it's interesting that their chaperoné says the same thing Kitami did 2 chapters ago; that wiping them all out is impossible. Our boy knows that, but Kitami pretends that it is their "shared dream" because he doesn't want to explain Nomamotos motivations, and also because he genuinely deluded himself into thinking it was a thing - because otherwise Nomamotos utter unfazedness at killing and eating people is too fucking weird for him. And he really wants to hang out with someone that might understand...
She didn't hate them that much to begin with. She was just annoyed with getting hit over nothing and being poor.
I suspect and predict that the author wants to make the point that while xenophobia might have real underlying causes, the people affected often take the wrong conclusions out of ignorance. Or they're just psychos like Nomamoto.