I do not have any problem from my past with the particular words of "good girl" but I just do not like it. It evokes patronage or manipulation. Maybe I do have an issue here.
However, I feel this is a deep topic for you. Unless you never want to hear them ever again, which you cannot guarantee in life, I would recommend as others said that you tell your therapist this bothers you with the intention that you want to process it and move along not completely delete these words from the face of earth. Or at least by talking about it in therapy, you may reach peace with it or just learn more about other words that may even pop up.
Personally, I do not have words that freak me out but certain movements freak the hell out of me. and I do not mean startle but more like extreme emotional reaction. I did not like my therapist standing behind me or moving around me...I would dock inside my head! but I did bring it up and I realised how pervasive this was in so many other ways in my life.
I am happy for you for the precision of noticing this feeling.