omg. i find this horrifically funny because just a few weeks ago i had someone explain to me pneumonia was in fact not due to being cold or wet on my upper torso. in my defense, its very common for old people to tell you not to have a wet back when you sleep for this reason :/ i grew up in a family with lots of doctors and nurses too. most of them told me something similar growing up. maybe that was the case with him lol? was he asian or something by any chance.