I had something similar to OP's experience, except that the woman didn't call me any names. I came up behind her with my cart in the Express lineup. I was using the cart because I had bought a couple of jugs of milk as well as a few other things. When she heard the wheels of my cart behind her, she turned around and gave me the Glare Of Death. Then, I think she counted my items, because she turned around again and didn't say anything.
Here's another experience. I was shopping at our local liquor store close to Christmas, so it was very busy. I had a number of items to buy, and I was using one of their little carts. The woman in front of me either didn't know there were carts or had picked up a lot more stuff than she'd expected, because she was carrying a lot of bottles in her arms, plus there was a case of beer by her feet that she had to keep kicking forward as the line for the cashier proceeded. When I came up behind her, once again, I got the Glare of Death - like it was somehow my fault that I was using a cart and she wasn't.
(Either that, or I have to check the effectiveness of my deodorant ...)