Joe is usually very agreeable, and goes along with his friends’ plans. Tonight, however, he tells his friends that he does not want to go with them to crash a party. Joe’s friends accept his refusal to join them, because Joe usually goes along with the group. This is because Joe has___________.

In psychology, the term idiosyncrasy credits refers to the capacity that one individual has to deviate from the social norms or from what the group expects from him/her.

The way this works is that when an individual conforms and follows the norms of the group, this gives him/her the "right" to deviate from these norms every now and them without fear of being punished or being reprimand for doing so.

In this example, Joe is very agreeable and usually goes along with his friends' plans (he conforms and follows the norms), however one night he doesn't want to go to a party, his friends accept because he doesn't usually do this, therefore, he is deviating from the norms this time but he is allowed to do so because he usually follows them. Therefore, this is because Joe has idiosyncrasy credits.