wfm, you say that you called him for business, and it went down hill from there...
How did that happen? Did someone bring up R talk?
What point was he repeating himself on? During that comm or on some past "offence" of you asking him the same question? Is it possible that he could feel you don't pay attention because you repeat questions? Or do you ask for clarification? Is his comment valid?
You DO speak to "normally, I would". And it all points to you calling him back. Which I suspect could mean that you call back to ask the same question. Which could lead him to think that you are not listening.
If that is the case, it is really good that you are stopping yourself to re-engage him. It is a clear 180 that eventually, with consistent action from you, will become normal for you and he will come to believe as a permanent change in you.
I'm not sure who made the comment of "YOU are talking AT me"?
Is the $300 that is unaccounted for from the business account?