How do Augustus and Hazel retell the story of Peter van Houten?

Hazel and Augustus split from her mother for the day and walk off to Peter Van Houten’s house. When they arrive, a bass beat is thumping loudly and they have to knock repeatedly to make their presence known. Van Houten pops his head out, and then slams the door on them again, yelling at her for inviting them to his house. Finally, he opens the door again, speaking to them harshly but ushering them inside.

His house, especially the living room they are led to, is strangely sterile but for two large, black garbage bags full of 18 years of fan mail. He offers them scotch, drinking multiple throughout their meeting and getting progressively drunker though it is still early morning. He talks to them about alcohol, insults their intelligence, rants about philosophy, plays them Swedish rap, and refuses to tell them what happens after the book ends.