This interaction between Rainbow and her T is helping her practice being more mindful of her responses and how they affect other people. I think it's important to see in this case that Therapisrs aren't at work 24/7 and chance interactions with our Ts outside of session don't automatically become part of therapy. I think her T mentioned feeling angry because she wanted Rainbow to know how this could have gone with someone else. That's not teaching someone to squash feelings, it's helping them learn to manage feelings. Real life doesn't always give you the chance to talk these interactions out with someone, so the fact yang this happened with Rainbow's T and not someone else is a good thing. This may not be your cup of tea, but it is valuable and therapeutic for many people.