my dad keeps calling me slow minded and weak every chance he gets. for example when i practice driving and he wants to get creative like making a turn backwards and it surprises me because it's dangerous and illegal, or points in a general direction and gives confusing orders and it makes me hesitate, so he calls me slow minded.
he also keeps telling me that everything that i do wrong is because i don't exercise and I'm physically weak.
while i know that both might be true (even tho i don't really consider myself dumb or slow minded) , i can realize my own weaknesses. i don't need him to keep saying these, and every time that i tell him to stop he doesn't listen and it kinda hurts that he thinks so low of me. 
what am i supposed to do? how can i even prove this to him?i get good grades in college but he has really high expectations.