I haven't seen any report saying they were in an unheated plane and without food. Yes, I have been through a long delay similar to that. The lengthy stay on the ground was about the same time as the flight would have been. The cabin crew fed us meals like normal, lavatories were always functional, and the in flight entertainment was also operational. Yes, a lot of people were irate, yelling at the cabin crew, being asses. When returning from a lavatory I stopped by a galley to get a drink. The flight attendant asked me if I was going to yell at her like everyone else. I told her that if it would get me to our destination I could yell as loud as anyone but since it wouldn't make any difference, make the best of it. Now if they had been unloaded into a cold terminal with inadequate seating and vending machine snacks, that would have been cruel and unusual.