My T gets a bit upset when I SI. Also I I share something sad or difficult she may get a bit emotional. Because she is tuning in to how I feel, and because I believe she cares, within reason. In many, but by no means all, forms of therapy, the focus is on the relationship between client and T as a vehicle of healing. This needs the T to show some parts of themselves, including their genuine responses and emotions. I guess your T was showing their frustration. It doesn't work for everyone. Personally, I couldn't work any other way.