Ah, sorry to hear that! I’m definitely not advocating harassing people or rudely taking up the time of cashiers who are having a horridly stressful day. I’ve worked as a cashier at a grocery as well, and it definitely has it’s annoyances! You make a great point that we should never be intentionally creating more stress for workers in our efforts to show solidarity.

Having said that, self checkouts are literally a direct threat to the jobs of human cashiers, and resisting that where possible is a good thing. It’s a sad reality that automation could be a great boon, but capitalism makes it a literal threat to survival.