"Oh, so you're a lazyhead." It's not criticism or teasing. She just states it with an amused tone.

But the fact she admits it to liking something makes her happy. It's even encouraging to have something to work on, to show Zeno her gratitude, to get him to smile more often. Or happier smiles, to be fair, as he likes to keep grinning.

"Aha! Then I'll try to find new things for you to try! Even if it's just a weird snack from the supermarket we've never eaten before!"