Misleading indeed. The fact that Irahl blinks and his eyebrows raise a bit says that he's startled when Vincent suddenly reanimates and plunks his glass down.

And it turns out that Vincent is correct on all fronts. Irahl had no idea that he'd liked a drink enough for it to become significantly noticeable to another person, just as he had no idea that he has been fixated on ice cubes every chance he's been able to get them. He knows that he'd abused the luxury of it on the ship, but he hadn't put much thought into it. It had just been a novelty that he hadn't been able to get back home very often. Neither the delight that it brought him nor the fact that others were never quite as enthused had ever registered.

In fact, he had done such a poor job of noticing these little things about himself that it still doesn't click.

"...Ice thing?"