I think that if the air is moist enough 38 degrees will overheat the body and kill it. Because the human body sweats to lose heat.
So some regions on earth are probably less pleasant when the temperature rises. While other regions are more tolarable for humans.
So there might be a reason why some people complain that they suffer from the heat. There could also be other reasons like their living conditions. A lack of ac and water, or living in a urban heat hell.
Lets not trivialize experiences of people who suffer.
Nice write-up