Hey, I admit, this was how *I* learned to differentiate barley from other grains.
We all have our own way of looking at and classifying things in our minds, and sometimes these lead to deeply-ingrained (no pun intended) perceptions about what a thing is or how we refer to it. Juni is thinking in terms of different types of grains or rice used for cooking, so she bears in mind all the actual-factual properties of the items. Joe has no such fixation and just remembers “brown, white, or butt crack rice”. To him, the world boils down much more simply since his perceived needs in this category are simpler.
Of course, on the other hand, Joe may have an extensive knowledge of Combat Engineer minutiae that others would find bewildering (even Juni, who is a computer maintenance clerk). So, when someone doesn’t seem to track all the details of one subject, they may be experts in another subject. It’s hard to remember that, since it seems to be human nature to consider subjects we command to be of primary importance to us, and if someone else doesn’t grasp the details, we have to switch gears a bit.