Clubby
WordNet
adjective
(1) Befitting or characteristic of those who incline to social exclusiveness and who rebuff the advances of people considered inferior
(2) Effusively sociable
"A clubbish set"
"We got rather clubby"
WiktionaryText
Adjective
Usage notes
In the sense of “feeling of a social club”, the emphasis can be more on the congeniality (friendly, treating all guests as welcome insiders: compare family diner) or on the exclusivity; compare cliquey.