[You mean: he's demon scum so of course he thinks like demon scum.
...And it's probably a look not all that dissimilar to the one that has the servants back home quietly backing away without further attempts to fix their own messes. Once it looks like Goku got it, and Sebastian can trust him to eat like a civilised person without constant supervision, Sebastian steps smoothly away from Goku's table and back behind the counter. He'll just whip up a pie or something real quick.]
Seeing as everyone needs to eat, feeding another person is a form of caring, that is true. In some instances it might mean saving that someone's life, after all.