Technically Not Super About Griff - Tumblr Posts

Why?

Today I’m wondering, why does Griff pick on Marty Jr. specifically? Heck why is there always a Tannen picking on a McFly in every generation besides Marty (and Seamus since he didn’t really let himself get bullied)? Is there some predisposed hatred? A prophecy made centuries before? Or is each generation just so petty about it that they tell their kid or grandkid to beat on whichever McFly, or McFly adjacent in Biff Jr’s case, they go to school with?