Comment by maccard

There’s two reasons to do this - as an interviewer, the way you present yourself to me is the way I expect you’ll present yourself as a representative of the team or company. It’s not good to air dirty laundry publicly, and if you can’t keep it under control when it’s almost an explicit “don’t trash talk your old job” the. There’s basically no hope of it when things are more relaxed.

Secondly, there’s three sides to every story. Yours, theirs and the truth. If I say “my manager is an asshole so I’m leaving his team”, it’s probable that my manager has a different take on it, maybe “maccard said they wanted to be kept in the loop so I am telling them what happening but they accuse me of changing my mind”.