Idk about you, but I haven't been asked to tip at my grocery store one time. I also shop at one that does cost a bit more but also does pay a bit more than other local competitors. You could always cook at home.

I also do tip food service on the rare occasion I patronize the business, which is another way. While you're still supporting the scummy business you don't also have to feel high and mighty about not tipping the exploited worker while doing so, you can just tip them instead.

Idk where you live, maybe it's different there, but where I am this is an absurd hyperbole. Never have I ever been asked to tip at the grocery store, for instance, nor at fast food places like mcdonalds and wendys that specifically forbid their employees from taking tips, nor megastores like Target, Walmart, etc, nor at local shops which tbh are almost all replaced by corporations around here anyway (hate it but I guess the people have spoken). Sure, restaurants, ice cream stands, coffee shops; y'know the places that have been customary to tip since like, what, the last 100 years? Yeah, they still ask for tips.

I will concede there is one unusual place asking for tips I've seen in my area, a thrift store, but they also pay fairly, it just so happens that they didn't design the android-tablet-POS-OS that they use and the people that did design it included a tip screen. Do I think the devs should make that optional, or make it able to be changed to donations instead of tips? Sure, but unfortunately they seem to have neglected that and afaik it's closed source, so unless they update it we're stuck with it.