Being nice and comporting up one's mien are two different things that just happen to coincide sometimes. What I've seen of this society so far makes it pretty clear they care more about being dainty than being decent.

Looots of class issues and magical bigotry. Also casual technophobia in some places, which quite frankly offends me as a scientist.

Me no likey.

[He uses the bread of his sandwich to try to mop a little mustard off his shirt.]

Would you believe it but earlier, me and this other chick had to bust some heads because some thugs were picking on a dog and a kid because he was, I dunno, a mudblood. Or something. Literally kicking puppies and children.

They're the ones that have something to learn.

[A pause.]

Also, why would I put my sandwich down when I'm talking to people? I'm eating it.

[He wants to talk to people but is also hungry. Therefore it's in his hands. And he's eating it. Logic.]

[(Being chit chatty alongside doing something else entirely different is pretty much his thing.)]