Isn't coffee made by grinding? How does it know not to grind the tea?

[ He's interested enough in this cool future technology that it actually distracts him from the pain in his hand, at least for the moment. ]

So you're meant to wear one of those when you pick up the kettle? [ He indicates the oven mitt, presumably hanging back up now that it's completed its heroic task. ] How on earth do they expect anyone to know that?