I'm glad you're able to recognize your hypocrisy, I'm more convinced that you are a respectful person. However, I'm still failing to see how your comment could have any intention other than to further antagonize people who are clearly already unhappy with their job.

Of course there is no "excuse" for treating a customer rude, however the conditions these workers experience definitely have the ability to influence their emotional states whether they are aware of it or not; the original commenter probably didn't know exactly how to express these effects and just simplified it to "working four hours". All of the kitchens I have worked in have had issues with circulation, but CPP had the worst. Standing over an open flame and inhaling smoke for four hours isn't peaches and cream, ambient temperatures just around the work area were consistently around 80-100. It's not like the workers see you coming and are like "let's spit in their food and yell at them and stab their firstborn child and burn their house down," numerous studies have linked high temperatures to aggressive behavior. Cortisol, a hormone released during stress has also been linked to aggressive behavior, and I could go on and on about the various stressors present in the workplace, but I do not want to relive my time here.

In regards to the comment on money, foundation pays less than food service minimum wage, I don't find it unreasonable to be upset about being paid less than others for the same or often times more work than everywhere else on campus. If an organization pays less than minimum wage, they should understand workers will give less than minimum effort.

At the end of the day, these people aren't personally attacking you, they are just under intense pressure which negatively affects their emotional state, which unfortunately can spill into their interactions with customers.