Yep, I have. Just the other night, in fact. Some lady was complaining that the self service counters were too sensitive that she couldn't put her own stuff there ("unexpected item in bagging area"). She went on to rant at me for it, and when I told her those machines were not built by me and that she should maybe raise the issue with higher management, she goes on to tell me that "since you still work here, you're part of the problem". She then goes on to tell me how unskilled and dumb I have to be to have to work in retail. That's when I said to her "Well, the fact that I'm a first year law student nullifies your point, but if it makes you feel any better, you may have it". I wish I could have gotten a pic of her horrified face! She then goes on and on about "arrogance and disrespect for older people" as she finishes off her purchase.