I don't think therapy should be considered a "safe space" for the client to exercise his or her skills as a verbal abuser. I also question whether it's helpful to accustom a person to being able to talk to someone else in any way they see fit without consequences. What's the point? Even if some therapists put up with such treatment, people in real life will not (unless they are so downtrodden they cannot defend themselves). So what is the purpose of the client verbally abusing the therapist? If the source of the anger is actually the therapist, I suppose this activity might relieve the client's feelings and has merit on that account. However, if the client is merely taking advantage of the situation to explore what it's like to not have to bite one's tongue, I again ask, to what end? What is the purpose of exploring what it's like to be able to curse someone out without consequence? I can't imagine learning anything good from that - I mean, think what you would want to teach a kid. And there can be consequence without utter rejection. It just sounds to me like your therapist has created a bit of a monster with these emails and gone a bit far with the validation. There's a point at which it gets ridiculous.