I'm not going to help my coworker when he's behind in his work.
Is there a reason you won't help your coworkers?
Yes, his job is so simple, it's annoyingly and boring to do.
I understand, but it's usually expected that you help out people at work. You should help them because you're getting paid to do so.
I just don't like to help people.
You need to be a better team player and do more to help others.