I had 2 interviews with 2 PMs. Situational questions, evaluating a product and discussing how I would improve it (Google Maps). Very professional interviewers. They wanted to test your problem solving skills, creativity and product sense.

The interviewer doesn't care about my response to his/her question and tries to belittle me for some little mistake such as estimation error, etc. However, some of my peers don't experience this so this should vary by interviewer.