Richard's decency in helping Door is not appreciated by London above, or in many ways by London below. In fact in both worlds we see acts of great selfishness it is under a veneer in London above that Jessica doesn't care about an injured girl or that Mr. Stockton doesn't really care about art or the guests. In London Below the stakes are higher, Lord ratspeaker would happily slit his throat. London below is more extreme because existence is more extreme but the motivations, selfishness among them are the same.
Richard is not only disoriented by the foreignness of London below but also by the lack of a group of friends who help give him definition.