I'm going to use his stuff after he told me not to
Why do you want to use his stuff?
Because I'm my own person with my own goals
You should not use peoples possessions if they tell you not to use them. That is a disrespectful thing to do.
I have to do what I have to do and I don't care what he thinks.
It is best to respect other peoples belongings so that they will do the same for you.