For example, I had a job interview a couple years ago where the interviewer showed up fifteen minutes late for a thirty minute interview. Eventually he did show up, and the interview proceeds more or less fine, and near the end he asks if I have any questions. I said "is it common to show up fifteen minutes late for interviews that you schedule? Because it comes off as unprofessional to me".
He started giving me a bunch of excuses about how busy he was and eventually I interject and say "Listen, I don't really care. I'm sure your reasons are valid to you but from my perspective it just looks like you were happy enough to let me waste half the interview just sitting around staring at my watch."
A day later the recruiter tells me that they don't want to move forward. I asked if they gave a reason why and apparently they thought I wasn't a good "culture fit".
I wish I could say I'm above it and that I'm some hyper-stoic who always wants the most direct version of everything, but I'm certainly not immune to wanting some niceties instead of complete blunt directness all the time. I try and be above it, but I'm not.