Personally, I both agree and disagree with your character's speech. But I'll speak for only Irene since she's my character. First, she's kind of rough-and-tumble in general, probably because of what's happened. Speeches like that strike her as insincere, I guess. Then I take into account her history: She's had bad experiences with her parents and after that with her caretakers, and bad experiences in childhood tend to really stick with people.