Lack of presence. Any interviewer that's not giving the interview as much of their full attention as possible (emergencies aside, of course). I've been on both sides of this, and I feel bad for interviews I've given where I was distracted or underprepared.
Conversely, my best interviews (and 1:1s) have been with people who are fully present.
Conversely, my best interviews (and 1:1s) have been with people who are fully present.