I have never removed anything from the cart of a ham. I've also never missed the opportunity to scoff, giggle, point, raise my eyebrows, shake my head or make a face that clearly shows my disgust at their horrible choices.  I have been known to intentionally get in line behind a fat while pretending to be talking on my phone. I would say aloud what my imaginary caller was requesting. Always much healthier choices than what was congealed in their carts. "No, I'm not buying granola bars, they're candy bars intended to make ignorant people think are eating something healthy." Laughing at the stupidity. Or, "I'm not buying cupcakes because last time I had to throw most of them away because no one ate them."