Its all very much of a judgment call as to if the whole flight is safe , I would rater see a student make a good recovery from a mistake that not make any mistakes at all.
Perfect students are a bit of a worry as you dont know how they will react when something dose go wrong ( and it will ) fortunatly the perfect students are not very common !.
It sounds to me that you need another instructor , this is not a critisisum of the instructor but sometimes if things are said in a diferent way the student will react in a more positive way.