I usually find when people discuss fit, it's helpful to ask specifically what behaviors indicated which personality traits that the co-worker is trying to filte

I usually find when people discuss fit, it's helpful to ask specifically what behaviors indicated which personality traits that the co-worker is trying to filter out. Asking for precision also shifts the discussion from something general like fit to specific things like which traits is this company trying to select for, and whether or not the other interviewers agree that a behavior indicated a specific personality trait. I don't have studies to back this up, but I find personally it helps give an avenue for co-workers to argue against bigotry without accusing anyone of behaving in a bigoted away.