It's considered friendly to socialize with everyone at a party.
Fenner is about to leave a small party but hasn't talked to the host yet.
Fenner wants to leave soon.
Fenner gets to the host and has a quick chat before leaving.
Fenner decides to go home without speaking to the host.
Fenner feels relief and doesn't offend anyone.
The host is offended and Fenner is not invited again.