Worst PM interview experience

Recently gave a PM interview with a b2c saas company. I was asked to do a take home assignment. The interviewer has no intention of conducting the interview. He was late and he looked like he just woke up from sleep. The questions were all over the place. And he didn’t even spent 5 minutes going through the case study I prepared. I don’t know why people take interviews when they are not interested in it. Such a waste of time!!!!