Saying you are not God, or you are not my father, in reaction to denial of certain instruction from a regular human being, is a prove of rebellion.
Yes, the validity of the statement is undeniably true. However, it is from the terminology used, that a judgment against the person is valid.
If one had responded...why would you want me to do this or that? How is it so? etc. One could have been seeking after the truth earnestly.
If however, one challenges the authority by exclaiming the obvious truth, that the object is neither God nor one's father, one is logically concluding that one's father or even God, has the right to order unreasonably. Ergo, one is saying that God or one's father is unreasonable!
So psychologically, it can be concluded, that such one has no respect for one's father and even God. The veil has become transparent.
Of course, this argument is has interest only in the speaker of the statement "You are not God", and is not sufficient to judge or be accused of representing the other parties involved.