Therapists who are emotionally mature should be able to hear upset remarks from clients without personalizing those remarks. Professionals who become angrily defensive have lost their professionalism.

That is not to say that the professional has no right to require a client to show some modicum of respect. Psych facilities generally issue a statement of Rights and Responsibilities that says patients are to be treated with respect and they should treat staff with respect. That same expectation should prevail in offices, as well. This can be a teaching opportunity for pdocs and therapists. Clients of psych services often come from environments where they have not been respected and may be confused about the respect they owe to others. It is way more the responsibility of the clinician to uphold principals of mutual respect and teach those as part of therapy. The professional cannot forbid the client from having emotional outbursts. That goes with the territory. But a skillful, mature professional should be committed to resolving that upset in a way that promotes respect for the dignity of both parties. That may take more than one session to do. The professional does that calmly. Anyone can lose their cool. That's human. The professional calms down and revisits the exchange in a way that is instructive about the respect that persons working together owe each other.

The professional does not try to win a game of one-upsmanship. Implying that a client is never going to have friends and will probably end up alone in the world is pretty obviously nothing more than emotional retaliation by someone who is probably too thin-skinned to be in this line of work.