“I’m just thinking out loud. Why do most men wear socks and are not bothered by the heat. In places where it’s very hot the men too don’t wear socks? “
Says who — Says who? Have you actually interviewed most men, to have reached that conclusion? My husband and sons are VERY bothered by the heat. They wear socks only if they are wearing shoes. If they wear sandals, which are only appropriate in some places, they do NOT wear socks. They would not walk into shul that way, but they will go out for a day in the park, the zoo, shopping, etc. in sandals.
IN E”Y many non-chareidi frum people wear sandals. Socks cause feet to sweat and promote the growth of fungal infections, not to mention foot odor.