I've been wearing short sleeve shirts a long while, too.
Now I will admit that I haven't bought any short sleeves in the last few years. I just cut the long sleeves off of my dress shirts and had them hemmed. Worked for me.
I wonder if living in a place where it gets in the high 90's and low 100's changes your opinion of short sleeves?
Of course there are those who would say that my short sleeve shirt wearing only serves to confirm their already long held opinion of my lower class status. They would say that I am the only one surprised by such revelation.
Then again I think "they" believe that just about all of us who live in "flyover country" are lower class. And I guess they believe that those of us here in Oklahoma are about as low as low class gets.
Well -- there you have it.