And he's still an ***hole except when he's speaking directly to George and his family, and George just laughs it off. The guy is basically a sociopath who hasn't changed one bit. Does George really not see the kind of person he's dealing with, or is he just banking on Biff's fear of him (over something that happened 30 years ago) to protect him? It's poor judgement. Even if Biff's actions in the past weren't enough to say, "get off my property and never come back", his present actions are. Come to think of it, the implication there is that George likes yanking Biff's chain enough that I've gotta wonder what kind of person George really is.