They are absolutely buying goods that are manufactured in countries subject to these tariffs. They have to buy clothes and all sorts of everyday items, and since they can't afford to buy things manufactured in the US (when that's even an option), it's very likely they buy things that are made in China/etc at a higher rate that wealthier people. Even going back to your examples, flour will be going up in price, as well as gas and car parts.

Your comment insinuates that people complaining about tariffs are disconnected from those living in poverty, but thinking that those living in poverty won't be affected by prices going up around the board is a much bigger disconnect.