There is something I have encountered at quite a few interviews which immediately made me nope out of wanting to work there; it's when the interviewer starts bragging about how hard they work, how long the hours are, or how hard the job is. I have had interviewers actually talk in a bragging tone about how many unpaid hours they work and how 'dedicated' they are to the job, or about how stressful the work environment is, almost as if it's a badge of honor to work a terrible job for no reward. I guess they do it to try and ween out anyone who is unwilling to sacrifice their mental and physical health for a job.
What other red flags seem to be the most common?