I’m surprised to see the act of putting conscious thought into maintaining positive relationships with others defined as “[playing] theatrics.” There are far more theatrics and drama involved in making a point to talk shit and burn bridges in the guise of honesty than there are in simply turning the other cheek and moving on.

Even if you are correct, telling your would-be boss in an interview that your coworkers were pretty and childish is an enormous red flag. Speak to the kind of behaviour that happened, not what you think about it, if you genuinely want to be honest. “I felt overworked as a result of my coworkers failing to meet the expectations put on them by management” is not the same as “my coworkers were lazy.” One is a mixture of perspective and reasonably verifiable outcomes, while the other is a subjective value judgement. Spouting opinions and calling it “honesty” is not honest.