That's what I meant about it being a cultural difference. Thanks for adding the first hand experience.
I thought the part of the video where they said something like "mealtime is about sharing and conversation" to be particularly interesting in that it really highlighted the difference.
One day I was volunteering in Mo's class when lunch rolled around and he asked me to have lunch with him so I said okay. He'd brought his lunch, I had to go through the line. They had this huge tray of sliced up kiwi. I love kiwi so I took a couple of big spoons of it. When I got to the table Mo was eying the kiwi so I offered him some. "We aren't allowed to share food." was the reply. The rest of the kids all nodded.
It turns out it was some kind of a "safety" deal but I still think it's a weird rule.
Also, they get 25 minutes (I think) for lunch and recess so they all try to eat in 3 minutes so they can go outside. Which, as Soz pointed out, is a terrible way to eat.