I went to Disney World in January one year, flew in from blizzard conditions and arrived to 60 degree "winter" weather. The native floridians gave me strange looks for not having a coat, and no joke, I saw some of the DW staff in parkas. Craziness.
Not all southerners are that way.
Couple years back we actually got some snow ( which is rare as fuck in south texas ) and it was down to about 20 degrees or so.
Half the people where I work didn't show up because of the ice and snow on the roads. Which, considering the fact that they're ill prepared for such conditions and have no idea how to drive on them, was probably pretty smart.
I went to work though. And on break, I was outside in just jeans and a tshirt, smoking my cig. Everyone else thought I was fucking nuts, and they were bundled up in layers of clothing and jackets.
I work in 35-40 degree temps on a daily basis. No jacket. I sweat too much if I do wear a jacket.
So yeah, we're not all afraid of the cold. And if push comes to shove, we can simply layer on clothing, adapt and all that.
But as was formerly stated by Idle. I highly doubt any of the northerners could handle our hot weather. I remember in NY a year or so ago, it got hot and they were reporting that people were literally dying from the heat. And it was hardly above 100. Generally we have temperatures in the triple digits for a few months during summer. It was sad, but kind of amusing. I guess people up there don't have AC's?