Kindness for the sake of kindness is so rare as to be foreign to him, and he doesn't trust it. The answer is obviously frivolous, but Khan finds himself easing into the attempt at conversation.

"I'm familiar with the concept of British sensibilities." He was, after all, raised in India - for a given definition of 'raised' - and had spent a not-insignificant amount of time London. The customs were not entirely dissimilar.