Exactly. She is a bully, plain and simple. She is using a well-worn technique that bullies use where they accuse someone of being mean, angry, a bit** or whatever, and most kind, normal people would react in a horrified way and bend over backwards to make sure they are not behaving in that manner.
She thought by accusing JM of being "angry" he would apologize and bend over backwards to be kind and soft spoken towards her.
Big fail. Just made her look passive-aggressive and defensive. He did exactly the right thing. The "truth" as she calls it, doesn't care how the prosecutor feels about the witness. She should testify the same whether he is angry or not angry. She is trying to control the testimony. She needs to knock it off and just answer the questions without trying to figure out where he is going. If she continues in her present mode, the jury will go from disliking her to despising her in short order.
She thinks she is smart. She is not as smart as Juan, and the sooner she accepts that, the better for everyone.