Sure, there are several people out there doing jobs they hate, especially in the service industry. Having flown so much and seen what the airline attendants have to deal with, likely on a daily basis, I'd hate that job, too. That doesn't mean there is an endemic problem with airlines treating people badly. It means there are incidents where people have been treated badly by seemingly a-holes.
Looking at this incident, the airline attendant could have been a little more cognizant of her situation, maybe communicate a little better with questions rather than demands to try to help her rather than make the whole situation more stressful: mother traveling alone with two babies (ugh, just thinking about that makes me feel anxious), trying to get one secured while also attending to the other with a line growing behind her with possibly less than understanding passengers and an annoying flight attendant expecting her to do all this quickly and agreeably. Sure, she has to take the stroller back to the jet bridge to check, but maybe she had items still inside it (like a wallet, or bottles, or a toy that helps calm one of the babies) that she needed to remove before sending it on the way. Some folks just might be missing that compassion gene.
Or maybe the mother could have explained the situation a little more to the flight attendant, but that assumes there was no language barrier. Even without the language barrier, how much do you have to communicate an obviously overwhelming situation (one made so much worse with a language barrier).
But who knows except those that were there. I'm just surprised no one stepped in to help her while trying to get the babies situated. The times that I've witnessed this situation in the past, flight attendants or fellow passengers are more than helpful, including me. I'd say it says more about the compassion of the people in general than the airline. Bunch a lamers.
Edit: Adding that when one person reaches out with a kind gesture in the form of assistance, it makes it that much harder for the a-holes to react in their a-hole ways.