A previous therapist very randomly called me a b**** during a one and only spontaneous role play in which she was the only one to "play" and the person she was pretending to be was not the kind to say something like that, so it was jarring and off-putting because she had called me that but used the excuse of a role play (again, which didn't even fit the topic).

What yours did was horrible, but not surprising given what you've shared about her.