Japanese men and shorts

There’s something interesting about Japanese society that I couldn’t help but notice while I was overseas: very few Japanese men wear shorts. Young boys wear them, but I hardly saw any guys above the age of middle or high school who weren’t wearing pants. At first I thought it was just some sort of regional thing, but it held true everywhere I went in Japan. Even way out west in Kyushu where it can get really warm I saw almost no men in shorts. I have no idea why this is, but Japanese men just aren’t big on them.