Bon

A Bon is an insult used to generalise a group of people who watch anime. It usually has a negative connotation (and rightly so) as it has been related with terrible loli anime and general paedophilia.

The plural of the word Bon is Bons, and a group of Bons would be called a Flock, used as a relation to the fact that Bons will fly away to their anime lands.

Person: Hah, look at that flock of Bons doing loli roleplay over there.