Oh, I hated that part of being a supervisor. People would get huffy when I asked a question there was no ulterior motive behind. "Have you done X yet?" would get a lot of "Well, no, I had to do Y and Z and I was busy!" Cool! I just needed to know if it was done yet. Argh.
While I'm not a supervisor, in this same vein, I hate when asking my co-workers if they've done this or that. Mainly at my PT retail job, and mainly so if not, I'll do it, or if they have, I'll do something else. Stuff like vacuuming the parts of the store that need it, emptying the trash, taking the hangers in the back, and so on. Some of them get quite defensive. Look, I'm not your manager, I just want to know what has been done, and what needs to be done, so we can ALL get out at a reasonable time!