I personally don't like the taste of orange juice – it's too acidic for me; I'd prefer just about any other fruit juice, or moo juice, or even water – but orange juice is a fixture of my workplace's lunch room, and yes, my coworkers are all adults. (Just don't tell them I admitted that.)
Coca-Cola? Depends on the food. With pizza, for instance, I'll insist on a caffeinated carbonated beverage. I prefer Pepsi Max¹ or Coca-Cola Zero¹, but plain Coca-Cola is not bad either. And yes, I think I qualify as an adult.
Different cultures, different strokes, I assume.
¹ Mind that the recipes, at least for Pepsi Max, which I tried in Spain, may vary from market to market, catering to its audience, so the versions you know, might not be identical to the ones I know.