"I really don't have a lot in common with the people who attend the Comic Con. It's like assuming that all people who write prose are the same"

Harvey Pekar's quote is a commentary on the assumption that all individuals who share a typical interest are the same. He is indicating that just because someone attends Comic Con, it does not imply that they have the same interests, worths, or beliefs as him. He is suggesting that it is incorrect to make presumptions about individuals based on their hobbies or interests. He is also indicating that there is a wide range of individuals who compose prose, which they are not all the exact same. His quote is a reminder that we need to not make assumptions about people based upon their pastimes or interests, which we must make the effort to learn more about someone prior to making any judgments.