This is a much bigger deal to me than difficult algorithm questions. Shitty interviewers give shitty interviews, regardless of what kinds of questions they ask.

The worst interview I ever had was like this. The guy showed up late, told me he forgot he even had an interview, gave me a strange question with little detail, and told me to start coding. Then ignored me for an hour while he typed on his laptop. Even when I directly asked for feedback to make sure I was solving the problem he asked and not a misunderstanding, he gave me basically no feedback. I've had interviews that I bombed before, but this was the first and only time that I felt like I bombed an interview and it was utterly not my fault. It was also the only time I've had a bad interview that actually ruined the rest of the day for me because it threw me off so much.