=》 (Father Zossima talking about Fyodor)
=》 Fyodor plays the victim in order to feel better about himself.
=》 For example, when Fyodor's first wife died, he went all over town, scandalizing everyone by telling how his wife used to beat him.
=》 He does this to gain the sympathy of others by making himself seem as though he is not to blame for the incident because he can not live with knowing he bears such guilt. Therefore, over time, he has unconsciously incorporated this behavior into his persona, regardless if he realizes it or not.
=》 Father Zossima has already deduced this and warns Fyodor that his tendency to always play the victim and lying to himself will lead to his own downfall by forgetting the feelings of love towards others, to which he will only become more miserable.
=》 To take pleasure in offense-taking means one finds pleasure in something that he did not find directly offensive or offensive at all, but rather he will display to the public that he has taken offense in order to fuel his self-importance further. This is what Zossima means by 'taking pleasure in taking offense'