Point of order - coffee does contain calories. Actual coffee beans contain quite a lot of energy. Most of that doesn't make it as far as the drink, but (1) we were talking about coffee in general, not just the drink, and (2) the drink is commonly served with milk and/or sugar, which add a lot of calories.
How about "if you had a cup of coffee, maybe you'd be alert enough to spot mistakes of that magnitude before publishing them"?
Depends where you get your coffee from, I guess. When I buy it, it's hot, sure, but not scalding, and it's drinkable within a few minutes.
But the point remains, there's nothing intrinsic to coffee that makes people serve it too hot, or drink it that way. That's 100% pure human error.