DoorDash Data Engineer interview questions

The interviewer seemed not to want to hire somebody. He occupied 10 minutes in the introduction and selected a tough and complex Python question. When I was coding, he did not listen. When I asked a clarifying question, he said to run the code yourself to verify if your understanding is right. And he shut down the coding pad without saying anything, or made up for the time he occupied. This is the most unprofessional and impolite interview I have ever experienced.