I agree that people don't know exactly what they want and are not well versed in policy, but I also think it's fair to ask what you would do instead of meeting them where they're at currently? it seems flattening to say that low info people only care about groceries. they care about affordability.
groceries and gas are expenses that people have to deal with multiple times a week and are very easy to track on a week-to-week basis so any increases, even if they're a small proportion of their income, are very noticeable. these concerns are nullified if affordability generally is tackled.
they are wrong in the details but they are correct in that affordability is a problem, and has been for a while. sure, we can't touch grocery margins but we can go after housing, healthcare, child care and transportation which are the actual largest line items in people's budget.
they wont care about $8 Oreo or whatever if their rent and child care costs are lowered substantially. I get that it's really frustrating that people don't know as much about the issues as you or I do but calling them stupid is not going to work. even if it's true. we do need to actually kill glonzo