Dialogue in the show suggests that he was more emotionally abusive ("Trying to punch through my door, screaming that he's going to kill me for no reason"
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A very important aspect of DEH is the dichotomy of reality versus illusion, from the perspective of the synthetic world of social media. Connor was a deeply troubled, emotionally abusive drug addict who was a burden on his family and terrorized his sister, but he still deserved love. He didn't deserve to die. Evan's lie about Connor tries to idealize him as a tortured soul martyr, but Evan was the one who tried to assert that Connor deserved human decency. I really doubt that Levenson, Pasek, and Paul would be trying to get us to sympathize with a child molester.