The entire point they were making is that CNN was dishonest about the professions of the people asking questions. Pretty hard to talk about that without getting into where they actually work.
Except all she did was toss him a softball about sexual harassment, there's nothing truly damning with her to do that with. They should be more angry with Bernie for messing that exchange up, she had no control over how he'd respond. Are they going to do this with every single person who gives him an awkward question now?