Embarrassingly, I was that counselor. When I did my training in Gestalt therapy, years ago, I was quite attached to working with people in that style. It does not refer to aggression which is therapeutic, but rather it connotes aggression perpetrated in the name of therapy. Most often it is designed to make the helper feel more comfortable or more important. It is never truly helpful.
All helpers run the risk of falling into therapeutic aggression.
It can take the form of gross manipulation, or it can be quite subtle. In the above instance, I wouldn't even let the client speak as she wanted. That's quite a flagrant example. Usually, it takes a more subtle form. We might be sitting with a friend who is having a hard time at work.