I found a full clip. She was talking and not in a question-and-answer situation. So he was being disruptive, but the situation was not handled properly.
Now, if a Republican tried this in Newsom's press briefing, this would have a whole different spin.

https://www.youtube.com/live/AP1ENz15SUg?si=Ggz7GKDm-7xhoGeY&t=325