I do hope that you get to start the Art Psychotherapy. You can only be honest with them in telling them that you need this to aid your recovery.
Perhaps keep thinking about the benefits of the Therapy, try not to mind the unusual comments: some of it is about administration and assessing risk, something they have to do in their job description. It is not unusual for support workers e.t.c. to have a check list that they have to stick to when speaking to a patient. Wishing you well. wishing you calm.