You cannot control anybody but yourself.
If you’re having trouble getting on the same page with someone else, it’s important to remember that the only person you control in the situation is yourself.
Even if the other person is “wrong,” (almost always a questionable assumption) telling him that usually will not be as effective as looking inside yourself and seeing what you can do differently. Then, slow yourself down, take a deep breath. And move forward with your new plan.
Obviously, what you’re doing now is not getting you what you want (unless it’s a disagreement). You might as well try something else.