If you describe a group of people or their behaviour as cliquey, you mean they spend their time only with other members of the group and seem unfriendly towards people who are not in the group.
[disapproval]
...cliquey gossip.
cliquey in British English
or cliquy (ˈkliːkɪ, ˈklɪkɪ)
adjectiveWord forms: -ier or -iest
exclusive, confined to a small group; forming cliques