Its ironic that his anxiety prevents him from getting diagnosed / treated for it. Probably quite common in mental health.
The middle of the bell curve for a particular trait (e.g. talking on the telephone) is normal - so about 90% of the population.
You want to redefine the word normal. OK, sure. What should I use? Different? Strange? Unique? Flower? Snowflake? I don't know. Sounds pretty odd behaviour to me. Not wrong, not bad, not dirty. Just weird. Odd. Not normal.
Sweating palms is a fear response. It's adrenaline and fight / flight. It's pathological, it interferes with his day to day life, and he deserves safe effective evidence based treatment.
I get to decide because i am human and humans make assessments about things and people.
I accidentally started a fight on HN by typing the exact opposite of my views, or at least something that could apparently be interpreted that way. I don't think I would have been misunderstood in the same manner in speech.
In speech your voice determines your tone. In text your reader determines your tone.
I'm sure you didn't mean it that way, but it's still something we all need to have the discipline and good taste to avoid. If we have to we'll add it to https://news.ycombinator.com/newsguidelines.html, but I'd rather avoid having a laundry list of verbotens.
I do wonder what you'd say if someone described a physical health problem and people suggested they go see a physical health doctor.
Also, text is not always a the best way of communicating- a lot of information is conveyed in someone’s voice which is often difficult to put on paper. It can also be way faster to speak to someone, particularly where a problem is a little complex and requires information to be exchanged between both parties multiple times.