Bad-mouthing a former boss or co-workers
There are all kinds of ways to talk about jobs that didn’t work out well, and many experienced interviewers can read between the lines and understand a
situation for what it is.
My recommendation is to take the high road when describing a situation that didn’t end well and avoid negative talk about a specific person or company. For instance, instead of saying that a former or current boss is unqualified or a poor manager, you could say that the situation didn’t meet your career objectives and you’re looking for a role where you can be a team player while learning new skills.