As someone who's had to conduct some interviews, that's the opposite of my reaction.
If I show up to an interview slot (for which I'm spending my 15-30m), and the candidate speaks up about a mis-scheduling or whatever, and convinces me it's not worth our time to meet, I'll be happy to regain my time and complain to the HRbot/hiring manager about scheduling issues (aka please don't waste the my/company's time by messing up the scheduling).
If I show up to an interview slot (for which I'm spending my 15-30m), and the candidate speaks up about a mis-scheduling or whatever, and convinces me it's not worth our time to meet, I'll be happy to regain my time and complain to the HRbot/hiring manager about scheduling issues (aka please don't waste the my/company's time by messing up the scheduling).