Why did the innkeeper not trouble himself about his guest?

It would have been unseemly for the innkeeper to show deference to a guest.

The landlord of the "Chat Gris"—by name, Brogard—had taken no further notice of his guests; he concluded that presently they would order supper, and in the meanwhile it was not for a free citizen to show deference, or even courtesy, to anyone, however smartly they might be dressed.