One previous T practically teared up with pride and joy the first time I flipped him off and stormed out.
I haven't been mad at my current T yet. It'll happen, I'm sure.
I would hope therapists would be okay with some degree of yelling or raised voices, as long a client doesn't verbally abuse them. For those of us who were never allowed to be angry when we were kids, it might be valuable. I don't know. Healthy anger expression isn't my strong point.
My T says he can tell I have a lot of anger, but his words are still kind of bouncing off of me.