I was just at Target in the (very slow) check out line and when I get up front I politely say hello to the checker and how she is. I get a very mumbled, "fine", I think.
Then when she finishes putting everything in bags one has way too many items so I ask for another bag. I get the eye roll and sigh, then the bag. I tell her in a sincere tone, "Thank you so much." No response. I then end the not so pleasant conversation with, "Have a good day." No "you too", no "thanks", not even an acknowledgement of my existence.
Not a huge deal, but honestly this is pretty much my experience in every store I go into whether it's Target, Duane Reade, H&M, etc. Basically if you go to any sort of affordable store you're getting crap customer service and it's so annoying!!!