This student went out in freezing weather wearing shorts and people can’t get enough of it
According to the above link a woman on twitter said:
[T]he same boy was on the 80 with me this morning again in a t-shirt and shorts. I'd love to know his reasoning!
I would imagine the reason is to demonstrate one's indifference to the harsh elements. Not to be craven and shiver and slink into a hole to get warm, but to walk erect, be proud, shake a fist at the Gods' who try to break our will with inclement weather. To be a man. To be special! To be a hero.