It’s only fair

Yea

**fewer* groceries

“Less” is for uncountable things, “fewer” for countable things.

For example, if you have less sand, that means you have fewer grains. Or if you have fewer dollars, you have less money.

If this logic isn’t apparent to you, another way to determine this is that uncountable things usually use a singular noun, even when there’s a lot of it. In fact, the same word can reference an uncountable amount of something in singular, or a countable variety of that thing in plural.

For example, a bakery that makes a variety of small bread rolls may use less flour than a bakery that bakes a lot of bread, but if it’s all the same type of bread, that bakery probably uses fewer flours than the other one.