T's will have feelings of anger, just like anyone else. I assume my T has had anger towards me on occasion, and that's okay. I can't say I've been particularly aware when he's been angry because he takes care of his own feelings, but there is no rule that just because a person is feeling anger that the other person is necessarily even aware of it. Anger is perfectly normal, and as long as the therapist handles their own anger appropriately, it is fine.