I should take priority, obviously, otherwise I wouldn't be the client.

I don't think you can tell someone else that they aren't allowed to feel certain things. That's ridiculous. Did you mean express instead of feel? Anger is allowed.

The definition of unkind probably differs from person to person. I feel too lazy right now to try to define it, but I will give an example of something the therapist said that struck me as unkind in my last session. I had come in feeling pretty depressed and didn't know what to talk about. We sat in silence for about 5 minutes. Then she asked me why I had come if I wasn't going to talk. This felt unkind and critical to me, as well as dumb since I would have been charged twice as much if I hadn't come.

I will tolerate a certain level of unkindness. If it could be down to my perceptions, like in the comment above, I'm not going to make a huge decision based on a one-off comment. If it were a pattern where I felt the therapist was being unkind in ambiguous comments, that might be different.

It depends on the transgression if I will give a second chance. I have accepted apologies before and overlooked other gripes. I'm not afraid of confronting the therapist.