American mental health professionals are often quite unfamiliar with aspects the ICD-10, despite its relevance to their work. Here is some basic information to help them.
I believe that psychotherapists are experts at interpersonal communication. We talk to people and, in so doing, help them have transformative conversations.
From the perspective of personal construct theory, President Trump's "alternative facts" exemplify hostility. But he's not alone. We all get hostile sometimes. It's human, but bad.