It's bad to exploit others.
It is almost the end of the semester and it is time for Jack to choose groups for the year end project.
Jack wants to get an A and pass the class.
Jack works with his friend, and they try hard together.
Jack partners with someone he does not like just because they are smart, and he wants to pass.
Jack does not offend anyone and while he has to work hard, he did it all himself.
The other person feels used and is hurt by Jack acting this way.