A glass of juice is (almost always) served cold. You can gulp it down in more or less the same time it takes for me to enter the room. Coffee is almost always drunk at higher than room temperature, and we like to savour it, to enjoy the taste over several consecutive sips.
Yes, of course it's possible to let your coffee get cold and then down it in one gulp, but in that case we would use a different verb than "had his coffee" or "drank his coffee", which tend to suggest that we are savouring the coffee in several sips for the pleasure of drinking it, rather than gulping it down in a hurry.
This is the problem with looking at sentences out of context: it's a wild goose chase of endless semantic and syntactic possibilities.