I don't think I would like it if my T was to call a true belief an irrational belief. If it is true, then I think I or who ever the client is will probably want to change the situation. For example, I have only three friends. If I said that to her, she shouldn't say that is an irrational belief. If I say that there is something wrong with me because I only have three friends, then I would want her to test the reality of the claim to see if there is or not. Perhaps, I need to be more sociable or maybe I'm shy. Maybe, I just don't have much time for socializing due to school and work. I think anyone of these reasons could be true without there being something wrong with me. So that belief could be safely called irrational.