I don't know what it is, but something about dudes in a short sleeved dress shirt and a tie irks me.
And, I'm serious when I say I don't know what it is. There's certainly an air of nerdiness about it, but that's not it.
It could be the fact that it looks kind of weird - like, look at me, I'm dressed up but airy and carefree .... maybe ...
It could be the fact that the wearer is attempting to exhibit their inner rebel streak - "I have to wear a tie, but I'll show you! Look ... short sleeves!"
I certainly don't fly into a rage ... but ... I don't get it.