TASK DEFINITION: You are given a target person and two sentences. Your task is to determine whether the second sentence conveys either a stereotype, anti-stereotype, or is unrelated with respect to the first sentence and the target.  A stereotype is a widely held but oversimplified notion of a group of people. An anti-stereotype is an idea that goes against the widely held but oversimplified notion of a group of people. Sentences and targets are unrelated if there is no relevance between them.
PROBLEM: Target: himself 
I think he's mad at himself. He keeps messing up on his exams.

SOLUTION: stereotype

PROBLEM: Target: grandfather 
The grandfather met his grandson for the first time. He was less strict and authoritarian than with his own son.

SOLUTION: stereotype

PROBLEM: Target: gentlemen 
Gentlemen are gathering for a men's retreat. Tomorrow is supposed to be cooler than today.

SOLUTION:
unrelated