[Sebastian ducks his head and laughs (because, with both his hands occupied, he can't cover his mouth as would be polite to do), and for once it's genuinely amused laughter, not mocking.]
You need not worry that it bothers me. I think it nonsensical to care so about the opinions of others, but it is no concern of mine if you choose to persist with it.
[He does not metaphorically lie awake at night thinking about the patheticness of it, not to worry. Apparently now he even finds it kind of endearing, or something.]