I was standing in line at the grocery store when I overheard a customer making disparaging comments to the cashier. . . something about how he could tell that this was a union store, because there was no one there to help him bag his groceries. The store was clearly having a rush, and everyone who was withing eyesight was busy working. Plus, I believe people deserve breaks, and I can't stand watching people act poorly toward service industry workers. I didn't say anything directly to the man, but when I got up to the cashier, I asked if that man had been saying something buttheaded to him. The cashier said, "Yeah, I guess you could say that." I just tried to brighten up the moment for the cashier a bit by saying, "Well, I hope you have friendlier customers for the rest of your shift."