If they ask you specific details, let them know exactly what happened. This means they are interested and what happened, and what exactly you did about the situation.

Otherwise, if they ask you something like "why did you leave your last job"

you can say something like:

I didn't feel that I was in a very positive work environment, and my co-workers were not interested in making any changes to promote a better workplace. The role wasn't right for me, but I am confident that this one is because .....

And then expand on that.

If they ask you for specific details, let them know exactly what happened. This means they are interested in what happened, and what exactly you did about the situation.

Otherwise, if they ask you something like "why did you leave your last job" you can say something like:

I didn't feel that I was in a very positive work environment, and my co-workers were not interested in making any changes to promote a better workplace. The role wasn't right for me, but I am confident that this one is because .....

And then expand on that.