My daughters father punishes her if she uses the words “okay” “good” “great”

My daughters father punishes our daughter by taking away simple things for example: (a contest they have on who can count the most cars driving with one head light) He will “deduct” a point from her score if she uses the words “okay.” “Great.” “Good.” When asking how her day at school was. She got upset and finally told me and said “why does every day have to be one of those words, because sometimes it’s not even a good day” “Dad said I have to use another word, like “stupendous” she absolutely hates this part of her day when she has to see him/talk to him after school.

Thoughts?! I know if I say something to him he will turn it into something making it seem like I’m doing the damage to her. What would you do????