Here was one coach's response:
"Haha, this video is infamous! It's the "proof" that critics of CrossFit use to try and show that the entire sport is dangerous and that we don't know what we're doing.
There are definitely examples in the video of athletes losing their midline, and going heavier than they safely should, but the point that is completely overlooked is that these athletes are trying classic strongman lifts for probably the very first time. The lift they're practicing is called the continental clean and, believe it or not, they're doing it more right than wrong. It's an awkward lift that's used for cleaning axle bars that are too fat to grip and clean conventionally. Anyone trying that for the first time will look similarly awkward. It's part of learning something new. Whoever originally shot and posted this video never meant for it to be taken as a typical crossfit class full of elite athletes. It's just a video of a group of people who aren't afraid to try something new, regardless of where are on the learning curve they had to start."
The coaches I've had have often been gung ho, yelling "GO GO GO" and "DON'T STOP WORKING" at us, but they also made me take plates off the bar when my form slipped. I can see how the first thing without the second could be dangerous.
Edit: I missed that someone else posted this below, but thought it deserved it's own easily seen distinction.