How we cite our quotes: All quotations are from Taxi Driver.
Quote #4
TRAVIS: But you can't allow him to do the same to other girls. You can't allow him to do that. He is the lowest kind of person in the world. Somebody's got to do something to him. He's the scum of the earth. He's the worst s-s-sucking scum I have ever, ever seen. You know what he told me about you? He called you names. He called you a little piece of chicken.
We didn't actually hear Sport call her "a little piece of chicken" but we did hear him say way more graphic and demeaning things about her (in addition to calling her a "b****" to her face). Travis hates Sport because Sport represents everything he dislikes about New York—coldness, heartlessness, money-driven exploitation of the innocent. He's trying to get Iris to see this instead of buying Sport's illusions.
Quote #5
IRIS' FATHER: There is no way we can repay you for returning our Iris to us. We thought we had lost her, and now our lives are full again. Needless to say, you are something of a hero around this household. I'm sure you want to know about Iris. She's back in school and working hard. The transition has been very hard for her as you can well imagine. But we have taken steps to see she has never cause to run away again.
Travis, despite committing a murder, earns the gratitude of Iris' parents and of society as a whole. Despite condemning and hating society, judging it negatively, he somehow receives the positive judgment of society as a whole by mirroring its own secret rage.