[S.T.D.]

You could reword it as Westerners being "only too self-centered" to get the intended meaning.

Not all dear ozone,

I used to have a western patient here who used to drop by on and off even when he was not sick just to share with me medical related articles he brings from home(he is not a doctor)
Cos his partner suffers from a rare disease which took many years to diagnose back home where he was from ..so he feels by sharing about this disease with all doctor no other patient will have a delay in diagnosis.

A nice kind person.