The article is not helping by saying it's pronounced Franken-STEEN. That just makes you think of Gene Wilder saying that repeatedly in Young Frankenstein and then it's even funnier.
This is an action of someone wallowing in negativity and engaging in revenge. Any amount of him, or others, saying "he’s just having fun" doesn’t change that. When his actions show he really has dealt with a difficult life experience and can let go of anger then maybe he’ll be able to have a better relationship in the future.