Upsetting snack

A few days ago I'm at the office, talking with the brigade S1 about something. As we're discussing, we're walking around and talking, as people do. I think nothing of it, as he goes to his food stash in the corner to pull out a can. It's mid-afternoon, and he's getting a snack; no big deal. As we're still hashing out the issue, he takes his red can of Campbell's tomato soup, pulls the lid off the can, and proceeds to lift it straight to his lips. I issued a direct order to him: "You will not drink that room-temperature condensed soup straight from the can! This is not a homeless shelter." He seemed quite puzzled by my horror, although he did grudgingly comply.
I don't consider myself a food snob, but -- sheesh -- I do have some standards.