[Wow, that's actually adorable. Sans is infamously hard to read based on his expression, but it wouldn't be wrong to note a bit of fondness in the way he watches her say that. Remind him of a young him, or something, in a way that isn't meant to be insulting. His tail swishes back and forth a couple times in interest, and then he sits down on the milk crate leisurely.]

Can't argue with that logic. As you can see, [he gestures at his ruined coat] I've been known to have a blast with them, myself.

...I'm more of a physicist at heart, though. Specialty in magical theorem.