What are quotes in Tangerine that make Erik’s choices negative?

It was "Erik." I was saying "Erik."
Dad finally understood. He looked right into my eyes and asked. "What do you mean by 'Erik'? Erik what, Paul?"
I stammered out, "Erik. He tried to kill me."

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I put the box down quietly and hurried back into my room. I turned on the computer, got into my private journal, and wrote until about eleven o'clock. Then I lay down on the bed and fell asleep—but I woke up almost immediately. Someone was running down the hall. It was Erik. I heard him run down the stairs, go out the front door, and pull away in a loud car.

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I looked through the patio doors and saw Erik and Arthur. They were laughing. I stepped closer to the doors, and I could hear Erik saying, "Did you see his hair? Did you see the side of his head? He got Mohawked, man!"
Arthur said, "Mohawked."
I watched them in disbelief. How could they be happy? Who were these two people? Then I realized it: They were the two people who will benefit from Mike Costello's death. And they were celebrating it. Erik grabbed at Arthur's shoes and screamed in a high-pitched voice, "The shoes! Gimme the shoes!"