The context of the following conversation is Alex was a firm believer in some really ridiculous ideas and theories, but with good arguments and logic, Casey changed Alex´s attitudes.:
Casey says I changed his mind on many things.
The friend responds Oh you mean Alex with his weird ideas ?.
Casey responds Yea but I proved my logic and had good arguments and that might have changed his mind.
The friend responds You are very smart.
Casey responds No I just wanted to prove him wrong basically.