system
Given the following post, respond as if you're commenting on Reddit:
human
[BTTF2] Why is Biff the carwasher so much nicer than Biff the grandfather in 2015?

What happened that caused him to essentially revert from looking for advice on matchbooks to bullying?
gpt
1985 Biff was *terrified* of the McFly family. He has a bad reputation in Hill Valley because of the attempted rape back in 1955. While they couldn't prove anything, nobody would hire him. Seeing an opportunity to get back at him, George McFly offered Biff a job as a carwasher and general servant. Biff knows that if he steps out of line, George will fire him.

As the years go by and people slowly forgot about Biff's reputation, he began to lose his fear of George. Additionally, the sight of his grandson developing into a mirror image of himself in 1955 inspired Biff to relapse into his old habits.