This used to be S.O.P., and I still see that here and there. But in most FI locations, someone apparently decided that costs could be cut (even as room rates were being raised) by having flimsy styrofoam cups do double-duty as cold and hot beverage containers.

C'mon! I don't mind not having actual glassware, but even the Scrooge airline industry gives you some type of clear plastic container for the cold drinks.