This is an opinion question, which means there is no wrong answer. Answer it however you would like.
I would say they are more believable if whoever has created the fake story hasn’t included any outrageous and nonrealistic details, since true stories are sometime so unbelievable because of the randomness of them.
Answer:
You can write a bit about the definition. In social psychology, a stereotype is an over-generalized belief about a particular category of people. It is an expectation that people might have about every person of a particular group. The type of expectation can vary; it can be, for example, an expectation about the group's personality, preferences, or ability.