Yes, Unfortunately this happens in Yosemite Valley a lot.
Some climbers think that because they are so near civilization they can be casual about their climb. But the walls of the Valley get very cold very fast at night especially when you did not prepare. I have seen folks out with no shirt and no backup gear. Even on the hottest days I always carry a mylar bivy (now the AMK Heatsheets bivy), a jacket and a micro-weight balaclava because things do go as unplanned when you climb.
Even on climbs I have done before I know there is a possibility of an epic; ropes get stuck, gear gets dropped, parties in front are slow as sh**, you name it.

I was very suprised that no one at Supertopo has called out the guys stupidity; it looks like he got a talking to by Keith Lober.
He is a notorious personality in the Valley. He is LEO and a YOSAR leader; I am told he loves busting climbers for anything he can. I bet he gave this guy an earfull.