Often, there's a mix of good and bad that must be weighed. However, if it's clearly bad, that's easy. Nobody in their right mind would encourage someone to stay in a clearly bad work environment or relationship. Don't know why a sports team would be any different.
It's a tough one.
My DD has been dreaming and planning (depending on her age) of playing Softball in High School with her friends. She would probably tolerate a lot of abuse to stick it out. Much more than I'd want her to.